1.16.5 -> 1.17

build.gradle

@@ -1,32 +1,43 @@
 plugins {
     id 'java-library'
     id 'fabric-loom' version '0.8-SNAPSHOT'
+    id 'org.ajoberstar.reckon' version '0.13.0'
 }
 
-apply plugin: 'fabric-loom'
+java {
-
+    toolchain {
-targetCompatibility = JavaVersion.VERSION_1_8
+        languageVersion = JavaLanguageVersion.of(16)
-sourceCompatibility = JavaVersion.VERSION_1_8
+    }
-
-version = "${project.minecraft_version}-${project.version}"
-
-if (project.release != 'RELEASE') {
-    version += "-${project.release}"
 }
 
 group = project.group
 description = project.displayname
 archivesBaseName = project.name
 
-// check for updates every build when on CI
-if (System.env.CI) {
-    configurations.all {
-        resolutionStrategy.cacheChangingModulesFor 0, 'seconds'
-    }
-}
-
 minecraft {
     refmapName = 'unicopia.mixin.refmap.json'
+    accessWidener 'src/main/resources/unicopia.aw'
+}
+
+reckon {
+    scopeFromProp()
+    stageFromProp('beta', 'rc', 'final')
+}
+
+repositories {
+    mavenLocal()
+    maven {
+        name = 'modmenu'
+        url = 'https://maven.terraformersmc.com/releases'
+    }
+    maven {
+        name = 'minelp'
+        url = 'https://repo.minelittlepony-mod.com/maven/snapshot'
+    }
+    maven {
+        name = 'minelp-release'
+        url = 'https://repo.minelittlepony-mod.com/maven/release'
+    }
 }
 
 dependencies {
@@ -34,23 +45,20 @@ dependencies {
     mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
     modApi "net.fabricmc:fabric-loader:${project.loader_version}"
     modApi "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
-    compileOnly "com.google.code.findbugs:jsr305:3.0.2"
 
-    modApi "com.minelittlepony:MineLittlePony:${project.minelp_version}"
+    modApi "com.minelittlepony:minelittlepony:${project.minelp_version}"
 
-    modApi "com.minelittlepony:Kirin:${project.kirin_version}"
+    modApi "com.minelittlepony:kirin:${project.kirin_version}"
-    include "com.minelittlepony:Kirin:${project.kirin_version}"
+    include "com.minelittlepony:kirin:${project.kirin_version}"
 
-    modCompileOnly("io.github.prospector:modmenu:${project.modmenu_version}") {
+    modCompileOnly("com.terraformersmc:modmenu:${project.modmenu_version}")
-        transitive = false
-    }
 }
 
 processResources {
-    inputs.property "version", project.version
+    inputs.property "version", project.version.toString()
 
     filesMatching("fabric.mod.json") {
-        expand "version": project.version
+        expand "version": project.version.toString()
     }
 }
 
@@ -62,16 +70,3 @@ task sourcesJar(type: Jar, dependsOn: classes) {
     classifier = "sources"
     from sourceSets.main.allSource
 }
-
-repositories {
-    maven {
-        name = 'minelp'
-        url = 'https://repo.minelittlepony-mod.com/maven/snapshot'
-    }
-    maven {
-        name = 'minelp-release'
-        url = 'https://repo.minelittlepony-mod.com/maven/release'
-    }
-}
-
-

gradle.properties

@@ -3,20 +3,18 @@ org.gradle.daemon=false
 
 # Fabric Properties
   # check these on https://modmuss50.me/fabric.html
-  minecraft_version=1.16.5
+  minecraft_version=1.17
-  yarn_mappings=1.16.5+build.4
+  yarn_mappings=1.17+build.5
-  loader_version=0.11.1
+  loader_version=0.11.3
-  fabric_version=0.30.3+1.16
+  fabric_version=0.34.9+1.17
 
 # Mod Properties
   group=com.minelittlepony
   displayname=Unicopia
   authors=Sollace
   description=Magical Abilities for Mine Little Pony!
-  version=9
-  release=BETA
 
 # Dependencies
-  modmenu_version=1.14.+
+  modmenu_version=2.0.0-beta.7
-  minelp_version=4.2.2-1.16.5-1.16-SNAPSHOT
+  minelp_version=4.3.4
-  kirin_version=1.7.1-1.16.2-SNAPSHOT
+  kirin_version=1.9.1

src/main/java/com/minelittlepony/unicopia/EquinePredicates.java

@@ -2,7 +2,7 @@ package com.minelittlepony.unicopia;
 
 import java.util.function.Predicate;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
 import com.minelittlepony.unicopia.ability.magic.spell.SpellType;
@@ -24,9 +24,9 @@ public interface EquinePredicates {
     Predicate<Entity> PLAYER_BAT = IS_PLAYER.and(ofRace(Race.BAT));
     Predicate<Entity> PLAYER_UNICORN = IS_PLAYER.and(raceMatches(Race::canCast));
     Predicate<Entity> PLAYER_CHANGELING = IS_PLAYER.and(ofRace(Race.CHANGELING));
-    Predicate<Entity> PLAYER_PEGASUS = IS_PLAYER.and(e -> ((PlayerEntity)e).abilities.creativeMode || RACE_INTERACT_WITH_CLOUDS.test(e));
+    Predicate<Entity> PLAYER_PEGASUS = IS_PLAYER.and(e -> ((PlayerEntity)e).getAbilities().creativeMode || RACE_INTERACT_WITH_CLOUDS.test(e));
 
-    Predicate<Entity> IS_CASTER = e -> !e.removed && (e instanceof Caster || PLAYER_UNICORN.test(e));
+    Predicate<Entity> IS_CASTER = e -> !e.isRemoved() && (e instanceof Caster || PLAYER_UNICORN.test(e));
 
     Predicate<LivingEntity> HAS_WANT_IT_NEED_IT = e -> EnchantmentHelper.getEquipmentLevel(UEnchantments.WANT_IT_NEED_IT, e) > 0;
 

src/main/java/com/minelittlepony/unicopia/InteractionManager.java

@@ -1,7 +1,7 @@
 package com.minelittlepony.unicopia;
 
-import javax.annotation.Nonnull;
+import org.jetbrains.annotations.NotNull;
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.entity.player.dummy.DummyPlayerEntity;
 import com.minelittlepony.unicopia.entity.player.dummy.DummyServerPlayerEntity;
@@ -38,7 +38,7 @@ public class InteractionManager {
      *
      * Returns an implementation of PlayerEntity appropriate to the side being called on.
      */
-    @Nonnull
+    @NotNull
     public PlayerEntity createPlayer(Entity observer, GameProfile profile) {
         if (observer.world instanceof ServerWorld) {
             return new DummyServerPlayerEntity((ServerWorld)observer.world, profile);

src/main/java/com/minelittlepony/unicopia/Race.java

@@ -6,7 +6,7 @@ import java.util.Set;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.google.common.base.Strings;
 import com.minelittlepony.common.client.gui.sprite.TextureSprite;
@@ -107,7 +107,7 @@ public enum Race implements Affine {
     }
 
     public boolean isPermitted(@Nullable PlayerEntity sender) {
-        if (isOp() && (sender == null || !sender.abilities.creativeMode)) {
+        if (isOp() && (sender == null || !sender.getAbilities().creativeMode)) {
             return false;
         }
 

src/main/java/com/minelittlepony/unicopia/WorldTribeManager.java

@@ -1,6 +1,6 @@
 package com.minelittlepony.unicopia;
 
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.server.world.ServerWorld;
 import net.minecraft.world.PersistentState;
 import net.minecraft.world.dimension.DimensionType;
@@ -9,8 +9,10 @@ public class WorldTribeManager extends PersistentState {
 
     private Race defaultRace = Unicopia.getConfig().preferredRace.get();
 
-    public WorldTribeManager(ServerWorld world) {
+    public WorldTribeManager() {}
-        super(nameFor(world.getDimension()));
+
+    public WorldTribeManager(NbtCompound nbt) {
+        defaultRace = Race.fromName(nbt.getString("defaultRace"));
     }
 
     public Race getDefaultRace() {
@@ -22,12 +24,7 @@ public class WorldTribeManager extends PersistentState {
     }
 
     @Override
-    public void fromTag(CompoundTag tag) {
+    public NbtCompound writeNbt(NbtCompound tag) {
-        defaultRace = Race.fromName(tag.getString("defaultRace"));
-    }
-
-    @Override
-    public CompoundTag toTag(CompoundTag tag) {
         tag.putString("defaultRace", defaultRace.name());
         return tag;
     }
@@ -37,6 +34,6 @@ public class WorldTribeManager extends PersistentState {
     }
 
     public static WorldTribeManager forWorld(ServerWorld world) {
-        return world.getPersistentStateManager().getOrCreate(() -> new WorldTribeManager(world), nameFor(world.getDimension()));
+        return world.getPersistentStateManager().getOrCreate(WorldTribeManager::new, WorldTribeManager::new, nameFor(world.getDimension()));
     }
 }

src/main/java/com/minelittlepony/unicopia/ability/Ability.java

@@ -1,6 +1,6 @@
 package com.minelittlepony.unicopia.ability;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.Race;
 import com.minelittlepony.unicopia.ability.data.Hit;

src/main/java/com/minelittlepony/unicopia/ability/AbilityDispatcher.java

@@ -8,7 +8,7 @@ import java.util.Map;
 import java.util.Optional;
 import java.util.stream.Collectors;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.Race;
 import com.minelittlepony.unicopia.ability.data.Hit;
@@ -16,11 +16,11 @@ import com.minelittlepony.unicopia.entity.player.Pony;
 import com.minelittlepony.unicopia.network.MsgPlayerAbility;
 import com.minelittlepony.unicopia.network.Channel;
 import com.minelittlepony.unicopia.util.NbtSerialisable;
+import com.minelittlepony.unicopia.util.Tickable;
 
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.sound.SoundEvents;
 import net.minecraft.util.Identifier;
-import net.minecraft.util.Tickable;
 
 public class AbilityDispatcher implements Tickable, NbtSerialisable {
 
@@ -78,10 +78,10 @@ public class AbilityDispatcher implements Tickable, NbtSerialisable {
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         if (compound.contains("stats")) {
             stats.clear();
-            CompoundTag li = compound.getCompound("stats");
+            NbtCompound li = compound.getCompound("stats");
             li.getKeys().forEach(key -> {
                 getStat(AbilitySlot.valueOf(key)).fromNBT(li.getCompound(key));
             });
@@ -89,8 +89,8 @@ public class AbilityDispatcher implements Tickable, NbtSerialisable {
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
-        CompoundTag li = new CompoundTag();
+        NbtCompound li = new NbtCompound();
         stats.forEach((key, value) -> li.put(key.name(), value.toNBT()));
         compound.put("stats", li);
     }
@@ -251,7 +251,7 @@ public class AbilityDispatcher implements Tickable, NbtSerialisable {
         }
 
         @Override
-        public void toNBT(CompoundTag compound) {
+        public void toNBT(NbtCompound compound) {
             compound.putInt("warmup", warmup);
             compound.putInt("cooldown", cooldown);
             compound.putInt("maxWarmup", maxWarmup);
@@ -263,7 +263,7 @@ public class AbilityDispatcher implements Tickable, NbtSerialisable {
         }
 
         @Override
-        public void fromNBT(CompoundTag compound) {
+        public void fromNBT(NbtCompound compound) {
             warmup = compound.getInt("warmup");
             cooldown = compound.getInt("cooldown");
             maxWarmup = compound.getInt("maxWarmup");

src/main/java/com/minelittlepony/unicopia/ability/ChangelingDisguiseAbility.java

@@ -1,7 +1,7 @@
 package com.minelittlepony.unicopia.ability;
 
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.ability.data.Hit;
 import com.minelittlepony.unicopia.ability.magic.spell.DisguiseSpell;

src/main/java/com/minelittlepony/unicopia/ability/ChangelingFeedAbility.java

@@ -3,7 +3,7 @@ package com.minelittlepony.unicopia.ability;
 import java.util.List;
 import java.util.stream.Collectors;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.Race;
 import com.minelittlepony.unicopia.ability.data.Hit;

src/main/java/com/minelittlepony/unicopia/ability/EarthPonyKickAbility.java

@@ -3,7 +3,7 @@ package com.minelittlepony.unicopia.ability;
 import java.util.List;
 import java.util.Optional;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.google.common.collect.Lists;
 import com.minelittlepony.unicopia.BlockDestructionManager;

src/main/java/com/minelittlepony/unicopia/ability/EarthPonyStompAbility.java

@@ -1,6 +1,6 @@
 package com.minelittlepony.unicopia.ability;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.BlockDestructionManager;
 import com.minelittlepony.unicopia.Race;
@@ -58,7 +58,7 @@ public class EarthPonyStompAbility implements Ability<Hit> {
     @Nullable
     @Override
     public Hit tryActivate(Pony player) {
-        if (!player.getMaster().isOnGround() && player.getMaster().getVelocity().y * player.getPhysics().getGravitySignum() < 0 && !player.getMaster().abilities.flying) {
+        if (!player.getMaster().isOnGround() && player.getMaster().getVelocity().y * player.getPhysics().getGravitySignum() < 0 && !player.getMaster().getAbilities().flying) {
             thrustDownwards(player);
             return Hit.INSTANCE;
         }

src/main/java/com/minelittlepony/unicopia/ability/PegasusCaptureStormAbility.java

@@ -1,6 +1,6 @@
 package com.minelittlepony.unicopia.ability;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.Race;
 import com.minelittlepony.unicopia.ability.data.Hit;
@@ -73,7 +73,7 @@ public class PegasusCaptureStormAbility implements Ability<Hit> {
         } else if (player.getOrigin().getY() < 120) {
             tell(player, "ability.unicopia.too_low");
         } else {
-            if (!player.getMaster().abilities.creativeMode) {
+            if (!player.getMaster().getAbilities().creativeMode) {
                 stack.decrement(1);
             }
 

src/main/java/com/minelittlepony/unicopia/ability/PegasusRainboomAbility.java

@@ -1,6 +1,6 @@
 package com.minelittlepony.unicopia.ability;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.Race;
 import com.minelittlepony.unicopia.ability.data.Hit;

src/main/java/com/minelittlepony/unicopia/ability/UnicornCastingAbility.java

@@ -2,7 +2,7 @@ package com.minelittlepony.unicopia.ability;
 
 import java.util.Random;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.google.common.collect.Streams;
 import com.minelittlepony.unicopia.Race;

src/main/java/com/minelittlepony/unicopia/ability/UnicornProjectileAbility.java

@@ -1,6 +1,6 @@
 package com.minelittlepony.unicopia.ability;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.google.common.collect.Streams;
 import com.minelittlepony.unicopia.Race;

src/main/java/com/minelittlepony/unicopia/ability/magic/Caster.java

@@ -4,7 +4,7 @@ import java.util.Optional;
 import java.util.function.Predicate;
 import java.util.stream.Stream;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.EquinePredicates;
 import com.minelittlepony.unicopia.Owned;

src/main/java/com/minelittlepony/unicopia/ability/magic/SpellContainer.java

@@ -2,7 +2,7 @@ package com.minelittlepony.unicopia.ability.magic;
 
 import java.util.Optional;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.ability.magic.spell.SpellPredicate;
 

src/main/java/com/minelittlepony/unicopia/ability/magic/Thrown.java

@@ -1,6 +1,6 @@
 package com.minelittlepony.unicopia.ability.magic;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.item.GemstoneItem;
 import com.minelittlepony.unicopia.item.UItems;
@@ -83,7 +83,7 @@ public interface Thrown extends Spell, ProjectileDelegate {
             projectile.setThrowDamage(getThrowDamage(caster));
             projectile.setSpell(this);
             projectile.setHydrophobic();
-            projectile.setProperties(entity, entity.pitch, entity.yaw, 0, 1.5F, 1);
+            projectile.setProperties(entity, entity.getPitch(), entity.getYaw(), 0, 1.5F, 1);
 
             world.spawnEntity(projectile);
 

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/AbstractPlacedSpell.java

@@ -1,6 +1,6 @@
 package com.minelittlepony.unicopia.ability.magic.spell;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.UEntities;
 import com.minelittlepony.unicopia.ability.magic.Attached;
@@ -11,7 +11,7 @@ import com.minelittlepony.unicopia.particle.OrientedBillboardParticleEffect;
 import com.minelittlepony.unicopia.particle.ParticleHandle;
 import com.minelittlepony.unicopia.particle.UParticles;
 
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.util.Identifier;
 import net.minecraft.util.math.Vec3d;
 
@@ -74,7 +74,7 @@ public abstract class AbstractPlacedSpell extends AbstractSpell implements Attac
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         super.toNBT(compound);
 
         if (dimension != null) {
@@ -84,7 +84,7 @@ public abstract class AbstractPlacedSpell extends AbstractSpell implements Attac
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         super.fromNBT(compound);
         if (compound.contains("dimension")) {
             dimension = new Identifier(compound.getString("dimension"));

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/AbstractSpell.java

@@ -6,7 +6,7 @@ import com.minelittlepony.unicopia.Affinity;
 import com.minelittlepony.unicopia.ability.magic.Caster;
 import com.minelittlepony.unicopia.ability.magic.Spell;
 
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 
 public abstract class AbstractSpell implements Spell {
 
@@ -69,13 +69,13 @@ public abstract class AbstractSpell implements Spell {
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         compound.putBoolean("dead", isDead);
         compound.putUuid("uuid", uuid);
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         isDirty = false;
         if (compound.contains("uuid")) {
             uuid = compound.getUuid("uuid");

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/AttractiveSpell.java

@@ -1,7 +1,7 @@
 package com.minelittlepony.unicopia.ability.magic.spell;
 
 import java.util.List;
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
 import com.minelittlepony.unicopia.ability.magic.Thrown;
@@ -14,7 +14,7 @@ import com.minelittlepony.unicopia.util.shape.Sphere;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.ItemEntity;
 import net.minecraft.entity.player.PlayerEntity;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.nbt.NbtHelper;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.MathHelper;
@@ -88,7 +88,7 @@ public class AttractiveSpell extends ShieldSpell implements Thrown {
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         super.toNBT(compound);
         if (homingPos != null) {
             compound.put("homingPos", NbtHelper.fromBlockPos(homingPos));
@@ -96,7 +96,7 @@ public class AttractiveSpell extends ShieldSpell implements Thrown {
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         super.fromNBT(compound);
         if (compound.contains("homingPos")) {
             homingPos = NbtHelper.toBlockPos(compound.getCompound("homingPos"));

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/DisguiseSpell.java

@@ -2,7 +2,7 @@ package com.minelittlepony.unicopia.ability.magic.spell;
 
 import java.util.Optional;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.FlightType;
 import com.minelittlepony.unicopia.Owned;
@@ -25,7 +25,7 @@ import net.minecraft.entity.data.TrackedData;
 import net.minecraft.entity.mob.MobEntity;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.entity.projectile.ProjectileEntity;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 
 public class DisguiseSpell extends AbstractSpell implements Attached, Suppressable, FlightType.Provider, PlayerDimensions.Provider, ProjectileImpactListener {
 
@@ -178,7 +178,7 @@ public class DisguiseSpell extends AbstractSpell implements Attached, Suppressab
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         super.toNBT(compound);
 
         compound.putInt("suppressionCounter", suppressionCounter);
@@ -186,7 +186,7 @@ public class DisguiseSpell extends AbstractSpell implements Attached, Suppressab
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         super.fromNBT(compound);
 
         suppressionCounter = compound.getInt("suppressionCounter");

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/IceSpell.java

@@ -20,6 +20,7 @@ import net.minecraft.block.PlantBlock;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.TntEntity;
+import net.minecraft.entity.Entity.RemovalReason;
 import net.minecraft.particle.ParticleTypes;
 import net.minecraft.tag.BlockTags;
 import net.minecraft.util.math.BlockPos;
@@ -63,7 +64,7 @@ public class IceSpell extends AbstractSpell implements Thrown, Attached {
 
     protected boolean applyEntitySingle(LivingEntity owner, Entity e) {
         if (e instanceof TntEntity) {
-            e.remove();
+            e.remove(RemovalReason.DISCARDED);
             e.getEntityWorld().setBlockState(e.getBlockPos(), Blocks.TNT.getDefaultState());
         } else if (e.isOnFire()) {
             e.extinguish();

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/JoustingSpell.java

@@ -15,7 +15,7 @@ import com.minelittlepony.unicopia.util.shape.Sphere;
 import net.minecraft.block.BlockState;
 import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.player.PlayerEntity;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Vec3d;
 import net.minecraft.world.GameRules;
@@ -72,7 +72,7 @@ public class JoustingSpell extends AbstractSpell implements Attached {
             ((Pony)source).getMagicalReserves().getEnergy().multiply(0.2F);
         }
 
-        return !source.getEntity().removed && age++ < 90 + 7 * (source.getLevel().get() + 1);
+        return !source.getEntity().isRemoved() && age++ < 90 + 7 * (source.getLevel().get() + 1);
     }
 
     private boolean canBreak(BlockPos pos, LivingEntity entity) {
@@ -85,13 +85,13 @@ public class JoustingSpell extends AbstractSpell implements Attached {
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         super.toNBT(compound);
         compound.putInt("age", age);
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         super.fromNBT(compound);
         age = compound.getInt("age");
     }

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/NecromancySpell.java

@@ -13,8 +13,8 @@ import com.minelittlepony.unicopia.util.shape.Sphere;
 import net.minecraft.entity.EntityType;
 import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.mob.ZombieEntity;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
-import net.minecraft.nbt.ListTag;
+import net.minecraft.nbt.NbtList;
 import net.minecraft.particle.ParticleTypes;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Vec3d;
@@ -89,7 +89,7 @@ public class NecromancySpell extends AbstractPlacedSpell {
         summonedEntities.forEach(ref -> {
             ref.ifPresent(caster.getWorld(), e -> {
                 if (master != null) {
-                    master.dealDamage(master, e);
+                    master.applyDamageEffects(master, e);
                 }
                 if (caster.getWorld().random.nextInt(2000) != 0) {
                     e.setHealth(0);
@@ -117,23 +117,23 @@ public class NecromancySpell extends AbstractPlacedSpell {
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         super.toNBT(compound);
         if (summonedEntities.size() > 0) {
-            ListTag list = new ListTag();
+            NbtList list = new NbtList();
             summonedEntities.forEach(ref -> list.add(ref.toNBT()));
             compound.put("summonedEntities", list);
         }
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         super.fromNBT(compound);
         summonedEntities.clear();
         if (compound.contains("summonedEntities")) {
             compound.getList("summonedEntities", 10).forEach(tag -> {
                 EntityReference<LivingEntity> ref = new EntityReference<>();
-                ref.fromNBT((CompoundTag)tag);
+                ref.fromNBT((NbtCompound)tag);
                 summonedEntities.add(ref);
             });
         }

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/ScorchSpell.java

@@ -1,6 +1,6 @@
 package com.minelittlepony.unicopia.ability.magic.spell;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
 import com.minelittlepony.unicopia.block.state.StateMaps;

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/ShieldSpell.java

@@ -27,6 +27,7 @@ import net.minecraft.entity.EyeOfEnderEntity;
 import net.minecraft.entity.FallingBlockEntity;
 import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.TntEntity;
+import net.minecraft.entity.Entity.RemovalReason;
 import net.minecraft.entity.decoration.ArmorStandEntity;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.entity.vehicle.AbstractMinecartEntity;
@@ -157,7 +158,7 @@ public class ShieldSpell extends AbstractSpell implements Attached, Thrown {
             if (!ProjectileUtil.isProjectileThrownBy(target, source.getMaster())) {
                 if (distance < 1) {
                     target.playSound(SoundEvents.ENTITY_ZOMBIE_VILLAGER_CURE, 0.1F, 1);
-                    target.remove();
+                    target.remove(RemovalReason.DISCARDED);
                 } else {
                     ProjectileUtil.ricochet(target, pos, 0.9F);
                 }

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/SiphoningSpell.java

@@ -17,7 +17,7 @@ import com.minelittlepony.unicopia.util.shape.Sphere;
 import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.damage.DamageSource;
 import net.minecraft.entity.player.PlayerEntity;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.particle.ParticleTypes;
 import net.minecraft.predicate.entity.EntityPredicates;
 import net.minecraft.util.math.BlockPos;
@@ -71,7 +71,7 @@ public class SiphoningSpell extends AbstractPlacedSpell {
     }
 
     private Stream<LivingEntity> getTargets(Caster<?> source) {
-        return VecHelper.findInRange(null, source.getWorld(), source.getOriginVector(), 4 + source.getLevel().get(), EntityPredicates.EXCEPT_CREATIVE_SPECTATOR_OR_PEACEFUL.and(e -> e instanceof LivingEntity))
+        return VecHelper.findInRange(null, source.getWorld(), source.getOriginVector(), 4 + source.getLevel().get(), EntityPredicates.EXCEPT_CREATIVE_OR_SPECTATOR.and(e -> e instanceof LivingEntity))
                 .stream()
                 .map(e -> (LivingEntity)e);
     }
@@ -147,13 +147,13 @@ public class SiphoningSpell extends AbstractPlacedSpell {
 
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         super.toNBT(compound);
         compound.putInt("upset", ticksUpset);
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         super.fromNBT(compound);
         ticksUpset = compound.getInt("upset");
     }

src/main/java/com/minelittlepony/unicopia/ability/magic/spell/SpellType.java

@@ -6,14 +6,14 @@ import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.Affinity;
 import com.minelittlepony.unicopia.ability.magic.Affine;
 import com.minelittlepony.unicopia.ability.magic.Caster;
 import com.minelittlepony.unicopia.ability.magic.Spell;
 
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.text.Text;
 import net.minecraft.text.TranslatableText;
 import net.minecraft.util.Identifier;
@@ -168,7 +168,7 @@ public final class SpellType<T extends Spell> implements Affine, SpellPredicate<
     }
 
     @Nullable
-    public static Spell fromNBT(@Nullable CompoundTag compound) {
+    public static Spell fromNBT(@Nullable NbtCompound compound) {
         if (compound != null && compound.contains("effect_id")) {
             Spell effect = getKey(new Identifier(compound.getString("effect_id"))).create();
 
@@ -182,8 +182,8 @@ public final class SpellType<T extends Spell> implements Affine, SpellPredicate<
         return null;
     }
 
-    public static CompoundTag toNBT(Spell effect) {
+    public static NbtCompound toNBT(Spell effect) {
-        CompoundTag compound = effect.toNBT();
+        NbtCompound compound = effect.toNBT();
 
         compound.putString("effect_id", effect.getType().getId().toString());
 

src/main/java/com/minelittlepony/unicopia/block/state/BlockStateConverter.java

@@ -1,7 +1,7 @@
 package com.minelittlepony.unicopia.block.state;
 
-import javax.annotation.Nonnull;
+import org.jetbrains.annotations.NotNull;
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import net.minecraft.block.BlockState;
 import net.minecraft.block.enums.DoubleBlockHalf;
@@ -27,8 +27,8 @@ public interface BlockStateConverter {
      *
      * @return    The converted state if there is one, otherwise the original state is returned
      */
-    @Nonnull
+    @NotNull
-    BlockState getConverted(World world, @Nonnull BlockState state);
+    BlockState getConverted(World world, @NotNull BlockState state);
 
     /**
      * Attempts to convert a block state at a position.

src/main/java/com/minelittlepony/unicopia/block/state/BlockStateMap.java

@@ -4,8 +4,8 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.function.Predicate;
 
-import javax.annotation.Nonnull;
+import org.jetbrains.annotations.NotNull;
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
@@ -31,8 +31,8 @@ class BlockStateMap implements BlockStateConverter {
     }
 
     @Override
-    @Nonnull
+    @NotNull
-    public BlockState getConverted(World world, @Nonnull BlockState state) {
+    public BlockState getConverted(World world, @NotNull BlockState state) {
         for (StateMapping i : mappings) {
             if (i.test(state)) {
                 return i.apply(world, state);

src/main/java/com/minelittlepony/unicopia/block/state/StateMapping.java

@@ -4,7 +4,7 @@ import java.util.function.BiFunction;
 import java.util.function.Function;
 import java.util.function.Predicate;
 
-import javax.annotation.Nonnull;
+import org.jetbrains.annotations.NotNull;
 
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
@@ -124,7 +124,7 @@ interface StateMapping extends Predicate<BlockState>, BiFunction<World, BlockSta
      * @return    True if the state can be converted
      */
     @Override
-    boolean test(@Nonnull BlockState state);
+    boolean test(@NotNull BlockState state);
 
     /**
      * Converts the given state based on this mapping
@@ -133,13 +133,13 @@ interface StateMapping extends Predicate<BlockState>, BiFunction<World, BlockSta
      *
      * @return    The converted state
      */
-    @Nonnull
+    @NotNull
     @Override
-    BlockState apply(World world, @Nonnull BlockState state);
+    BlockState apply(World world, @NotNull BlockState state);
 
     /**
      * Gets the inverse of this mapping if one exists. Otherwise returns itself.
      */
-    @Nonnull
+    @NotNull
     StateMapping inverse();
 }

src/main/java/com/minelittlepony/unicopia/client/ClientInteractionManager.java

@@ -1,7 +1,7 @@
 package com.minelittlepony.unicopia.client;
 
-import javax.annotation.Nonnull;
+import org.jetbrains.annotations.NotNull;
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.InteractionManager;
 import com.minelittlepony.unicopia.entity.player.Pony;
@@ -15,7 +15,7 @@ import net.minecraft.entity.player.PlayerEntity;
 
 public class ClientInteractionManager extends InteractionManager {
     @Override
-    @Nonnull
+    @NotNull
     public PlayerEntity createPlayer(Entity observer, GameProfile profile) {
         if (observer.world instanceof ClientWorld) {
             return new DummyClientPlayerEntity((ClientWorld)observer.world, profile);

src/main/java/com/minelittlepony/unicopia/client/KeyBindingsHandler.java

@@ -15,7 +15,7 @@ import com.minelittlepony.unicopia.entity.player.Pony;
 
 import net.fabricmc.fabric.api.client.keybinding.v1.KeyBindingHelper;
 import net.minecraft.client.MinecraftClient;
-import net.minecraft.client.options.KeyBinding;
+import net.minecraft.client.option.KeyBinding;
 import net.minecraft.client.sound.PositionedSoundInstance;
 import net.minecraft.sound.SoundEvents;
 import net.minecraft.text.TranslatableText;

src/main/java/com/minelittlepony/unicopia/client/ModifierTooltipRenderer.java

@@ -7,7 +7,7 @@ import java.util.Map;
 import java.util.Optional;
 import java.util.stream.Stream;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.google.common.collect.Multimap;
 import com.minelittlepony.unicopia.entity.Equine;
@@ -25,7 +25,7 @@ import net.minecraft.entity.attribute.EntityAttributes;
 import net.minecraft.entity.attribute.EntityAttributeModifier.Operation;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.text.LiteralText;
 import net.minecraft.text.Text;
 import net.minecraft.text.TranslatableText;
@@ -152,7 +152,7 @@ public class ModifierTooltipRenderer implements ItemTooltipCallback {
         if (!stack.isEmpty()) {
             return stack.getEnchantments()
                     .stream()
-                    .map(t -> (CompoundTag)t)
+                    .map(t -> (NbtCompound)t)
                     .map(tag -> Registry.ENCHANTMENT.getOrEmpty(Identifier.tryParse(tag.getString("id")))
                                 .map(ench -> new Pair<>(tag.getInt("lvl"), ench)))
                     .filter(Optional::isPresent)

src/main/java/com/minelittlepony/unicopia/client/URenderers.java

@@ -60,7 +60,7 @@ public interface URenderers {
         AccessoryFeatureRenderer.register(AmuletFeatureRenderer::new);
         AccessoryFeatureRenderer.register(WingsFeatureRenderer::new);
 
-        EntityRendererRegistry.INSTANCE.register(UEntities.THROWN_ITEM, (manager, context) -> new FlyingItemEntityRenderer<>(manager, context.getItemRenderer()));
+        EntityRendererRegistry.INSTANCE.register(UEntities.THROWN_ITEM, FlyingItemEntityRenderer::new);
         EntityRendererRegistry.INSTANCE.register(UEntities.FLOATING_ARTEFACT, FloatingArtefactEntityRenderer::new);
         EntityRendererRegistry.INSTANCE.register(UEntities.CAST_SPELL, CastSpellEntityRenderer::new);
 
@@ -84,10 +84,10 @@ public interface URenderers {
                 matrices.push();
                 matrices.scale(0.5F, 0.5F, 0.5F);
                 matrices.translate(0.0125, 0.1, 0);
-                renderer.renderItem(item.getAppearanceStack(stack), mode, light, overlay, matrices, immediate);
+                renderer.renderItem(item.getAppearanceStack(stack), mode, light, overlay, matrices, immediate, 0);
                 matrices.pop();
             }
-            renderer.renderItem(item.createAppearanceStack(stack, UItems.EMPTY_JAR), mode, light, OverlayTexture.DEFAULT_UV, matrices, immediate);
+            renderer.renderItem(item.createAppearanceStack(stack, UItems.EMPTY_JAR), mode, light, OverlayTexture.DEFAULT_UV, matrices, immediate, 0);
             immediate.draw();
 
             if (mode == ModelTransformation.Mode.GUI) {
@@ -96,7 +96,7 @@ public interface URenderers {
             matrices.push();
 
         });
-        FabricModelPredicateProviderRegistry.register(UItems.GEMSTONE, new Identifier("affinity"), (stack, world, entity) -> {
+        FabricModelPredicateProviderRegistry.register(UItems.GEMSTONE, new Identifier("affinity"), (stack, world, entity, seed) -> {
             return GemstoneItem.isEnchanted(stack) ? 1 + GemstoneItem.getSpellKey(stack).getAffinity().ordinal() : 0;
         });
         ColorProviderRegistry.ITEM.register((stack, i) -> {

src/main/java/com/minelittlepony/unicopia/client/UnicopiaClient.java

@@ -69,7 +69,7 @@ public class UnicopiaClient implements ClientModInitializer {
 
     private void onScreenInit(Screen screen, ButtonList buttons) {
         if (screen instanceof CreateWorldScreen) {
-            buttons.add(SettingsScreen.createRaceSelector(screen));
+            buttons.addButton(SettingsScreen.createRaceSelector(screen));
         }
     }
 

src/main/java/com/minelittlepony/unicopia/client/gui/ManaRingSlot.java

@@ -11,6 +11,7 @@ import com.mojang.blaze3d.systems.RenderSystem;
 import net.minecraft.client.render.BufferBuilder;
 import net.minecraft.client.render.BufferRenderer;
 import net.minecraft.client.render.Tessellator;
+import net.minecraft.client.render.VertexFormat;
 import net.minecraft.client.render.VertexFormats;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.util.math.MathHelper;
@@ -110,7 +111,7 @@ class ManaRingSlot extends Slot {
         RenderSystem.disableTexture();
         RenderSystem.defaultBlendFunc();
 
-        bufferBuilder.begin(7, VertexFormats.POSITION_COLOR);
+        bufferBuilder.begin(VertexFormat.DrawMode.QUADS, VertexFormats.POSITION_COLOR);
 
         Matrix4f model = matrices.peek().getModel();
 

src/main/java/com/minelittlepony/unicopia/client/gui/SettingsScreen.java

@@ -2,7 +2,7 @@ package com.minelittlepony.unicopia.client.gui;
 
 import java.util.Set;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.common.client.gui.GameGui;
 import com.minelittlepony.common.client.gui.ScrollContainer;
@@ -54,9 +54,9 @@ public class SettingsScreen extends GameGui {
         super(new TranslatableText("unicopia.options.title"), parent);
 
         content.margin.setVertical(30);
-        content.padding.setHorizontal(10);
+        content.getContentPadding().setHorizontal(10);
-        content.padding.top = 10;
+        content.getContentPadding().top = 10;
-        content.padding.bottom = 20;
+        content.getContentPadding().bottom = 20;
     }
 
     @Override
@@ -89,7 +89,7 @@ public class SettingsScreen extends GameGui {
             RIGHT = LEFT;
         }
 
-        children().add(content);
+        getChildElements().add(content);
 
         int row = 0;
 
@@ -115,7 +115,7 @@ public class SettingsScreen extends GameGui {
 
         content.addButton(new EnumSlider<>(LEFT, row += 25, config.preferredRace.get()))
                 .onChange(config.preferredRace::set)
-                .setFormatter(v -> new TranslatableText("unicopia.options.preferred_race", v.getDisplayName()).getString());
+                .setTextFormat(v -> new TranslatableText("unicopia.options.preferred_race", v.getValue().getDisplayName()));
 
         if (server != null) {
             row += 20;
@@ -125,7 +125,7 @@ public class SettingsScreen extends GameGui {
 
             content.addButton(new EnumSlider<>(LEFT, row += 20, tribes.getDefaultRace()))
                     .onChange(tribes::setDefaultRace)
-                    .setFormatter(v -> new TranslatableText("unicopia.options.world.default_race", v.getDisplayName()).getString())
+                    .setTextFormat(v -> new TranslatableText("unicopia.options.world.default_race", v.getValue().getDisplayName()))
                     .setEnabled(client.isInSingleplayer());
         }
 

src/main/java/com/minelittlepony/unicopia/client/gui/Slot.java

@@ -97,7 +97,6 @@ class Slot {
 
             // progress
             UHud.fill(matrices, slotPadding, progressTop, size - slotPadding, progressBottom, 0xCFFFFFFF);
-            RenderSystem.enableAlphaTest();
             RenderSystem.enableBlend();
         }
 

src/main/java/com/minelittlepony/unicopia/client/gui/UHud.java

@@ -3,7 +3,7 @@ package com.minelittlepony.unicopia.client.gui;
 import java.util.ArrayList;
 import java.util.List;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.Race;
 import com.minelittlepony.unicopia.ability.AbilityDispatcher;
@@ -25,6 +25,7 @@ import net.minecraft.text.Text;
 import net.minecraft.util.Arm;
 import net.minecraft.util.Identifier;
 import net.minecraft.util.Util;
+import net.minecraft.util.math.Quaternion;
 
 public class UHud extends DrawableHelper {
 
@@ -73,10 +74,9 @@ public class UHud extends DrawableHelper {
             renderMessage(matrices, tickDelta);
         }
 
-        RenderSystem.enableAlphaTest();
         RenderSystem.enableBlend();
 
-        client.getTextureManager().bindTexture(HUD_TEXTURE);
+        RenderSystem.setShaderTexture(0, HUD_TEXTURE);
 
         boolean swap = client.options.keySneak.isPressed();
 
@@ -84,7 +84,6 @@ public class UHud extends DrawableHelper {
         slots.forEach(slot -> slot.renderLabel(matrices, abilities, tickDelta));
 
         RenderSystem.disableBlend();
-        RenderSystem.disableAlphaTest();
 
         matrices.pop();
 
@@ -100,13 +99,17 @@ public class UHud extends DrawableHelper {
                     int x = scaledWidth / 2 + 67;
                     int y = scaledHeight - 25;
 
-                    RenderSystem.pushMatrix();
+                    MatrixStack view = RenderSystem.getModelViewStack();
-                    RenderSystem.translatef(x, y, 0);
+
-                    RenderSystem.rotatef(45, -0.2F, 1, 0);
+                    view.push();
+                    view.translate(x, y, 0);
+                    view.multiply(new Quaternion(-9, 45, 0, true));
                     InventoryScreen.drawEntity(0, 0, scale, 0, -20, client.player);
-                    RenderSystem.popMatrix();
+                    view.pop();
                 });
         }
+
+
     }
 
     private void renderMessage(MatrixStack matrices, float tickDelta) {
@@ -139,9 +142,9 @@ public class UHud extends DrawableHelper {
 
     void renderAbilityIcon(MatrixStack matrices, AbilityDispatcher.Stat stat, int x, int y, int u, int v, int frameWidth, int frameHeight) {
         stat.getAbility(KeyBindingsHandler.INSTANCE.page).ifPresent(ability -> {
-            client.getTextureManager().bindTexture(ability.getIcon(Pony.of(client.player), client.options.keySneak.isPressed()));
+            RenderSystem.setShaderTexture(0, ability.getIcon(Pony.of(client.player), client.options.keySneak.isPressed()));
             drawTexture(matrices, x, y, 0, 0, frameWidth, frameHeight, u, v);
-            client.getTextureManager().bindTexture(HUD_TEXTURE);
+            RenderSystem.setShaderTexture(0, HUD_TEXTURE);
         });
     }
 

src/main/java/com/minelittlepony/unicopia/client/minelittlepony/Main.java

@@ -1,8 +1,8 @@
 package com.minelittlepony.unicopia.client.minelittlepony;
 
-import com.minelittlepony.client.render.EquineRenderManager;
+import com.minelittlepony.api.model.IModel;
-import com.minelittlepony.model.IModel;
+import com.minelittlepony.api.model.ModelAttributes;
-import com.minelittlepony.model.capabilities.fabric.PonyModelPrepareCallback;
+import com.minelittlepony.api.model.fabric.PonyModelPrepareCallback;
 import com.minelittlepony.unicopia.Unicopia;
 import com.minelittlepony.unicopia.entity.player.Pony;
 
@@ -20,7 +20,7 @@ public class Main implements ClientModInitializer {
         PonyModelPrepareCallback.EVENT.register(this::onPonyModelPrepared);
     }
 
-    private void onPonyModelPrepared(Entity entity, IModel model, EquineRenderManager.Mode mode) {
+    private void onPonyModelPrepared(Entity entity, IModel model, ModelAttributes.Mode mode) {
         if (hookErroring) return;
         try {
             if (entity instanceof PlayerEntity) {

src/main/java/com/minelittlepony/unicopia/client/particle/AbstractBillboardParticle.java

@@ -10,8 +10,9 @@ import net.minecraft.client.render.BufferBuilder;
 import net.minecraft.client.render.Camera;
 import net.minecraft.client.render.Tessellator;
 import net.minecraft.client.render.VertexConsumer;
+import net.minecraft.client.render.VertexFormat;
 import net.minecraft.client.render.VertexFormats;
-import net.minecraft.client.util.math.Vector3f;
+import net.minecraft.util.math.Vec3f;
 import net.minecraft.client.world.ClientWorld;
 import net.minecraft.util.Identifier;
 import net.minecraft.util.math.MathHelper;
@@ -43,8 +44,6 @@ public abstract class AbstractBillboardParticle extends Particle {
                 GlStateManager.SrcFactor.SRC_ALPHA, GlStateManager.DstFactor.ONE_MINUS_SRC_ALPHA,
                 GlStateManager.SrcFactor.ONE, GlStateManager.DstFactor.ONE_MINUS_SRC_ALPHA
         );
-        RenderSystem.alphaFunc(516, 0.003921569F);
-
 
         Vec3d cam = camera.getPos();
 
@@ -55,7 +54,6 @@ public abstract class AbstractBillboardParticle extends Particle {
         renderQuads(te, buffer, renderX, renderY, renderZ, tickDelta);
 
         RenderSystem.enableCull();
-        RenderSystem.defaultAlphaFunc();
         RenderSystem.defaultBlendFunc();
     }
 
@@ -65,10 +63,10 @@ public abstract class AbstractBillboardParticle extends Particle {
         MinecraftClient.getInstance().getTextureManager().bindTexture(texture);
     }
 
-    protected void renderQuad(Tessellator te, BufferBuilder buffer, Vector3f[] corners, float alpha, float tickDelta) {
+    protected void renderQuad(Tessellator te, BufferBuilder buffer, Vec3f[] corners, float alpha, float tickDelta) {
-        int light = getColorMultiplier(tickDelta);
+        int light = getBrightness(tickDelta);
 
-        buffer.begin(7, VertexFormats.POSITION_TEXTURE_COLOR_LIGHT);
+        buffer.begin(VertexFormat.DrawMode.QUADS, VertexFormats.POSITION_TEXTURE_COLOR_LIGHT);
         buffer.vertex(corners[0].getX(), corners[0].getY(), corners[0].getZ()).texture(0, 0).color(colorRed, colorGreen, colorBlue, alpha).light(light).next();
         buffer.vertex(corners[1].getX(), corners[1].getY(), corners[1].getZ()).texture(1, 0).color(colorRed, colorGreen, colorBlue, alpha).light(light).next();
         buffer.vertex(corners[2].getX(), corners[2].getY(), corners[2].getZ()).texture(1, 1).color(colorRed, colorGreen, colorBlue, alpha).light(light).next();

src/main/java/com/minelittlepony/unicopia/client/particle/MagicParticle.java

@@ -64,8 +64,8 @@ public class MagicParticle extends SpriteBillboardParticle {
     }
 
     @Override
-    public int getColorMultiplier(float tint) {
+    public int getBrightness(float tint) {
-        int light = super.getColorMultiplier(tint);
+        int light = super.getBrightness(tint);
         float timer = (float)age / (float)maxAge;
 
         int v = light >> 16 & 255;

src/main/java/com/minelittlepony/unicopia/client/particle/OrientedBillboardParticle.java

@@ -6,7 +6,7 @@ import net.minecraft.client.render.BufferBuilder;
 import net.minecraft.client.render.Camera;
 import net.minecraft.client.render.Tessellator;
 import net.minecraft.client.render.VertexConsumer;
-import net.minecraft.client.util.math.Vector3f;
+import net.minecraft.util.math.Vec3f;
 import net.minecraft.client.world.ClientWorld;
 import net.minecraft.util.math.Quaternion;
 
@@ -20,8 +20,8 @@ public abstract class OrientedBillboardParticle extends AbstractBillboardParticl
 
         fixed = effect.isAngleFixed();
         if (fixed) {
-            rotation.hamiltonProduct(Vector3f.POSITIVE_X.getDegreesQuaternion(180 - effect.getYaw()));
+            rotation.hamiltonProduct(Vec3f.POSITIVE_X.getDegreesQuaternion(180 - effect.getYaw()));
-            rotation.hamiltonProduct(Vector3f.POSITIVE_Y.getDegreesQuaternion(effect.getPitch()));
+            rotation.hamiltonProduct(Vec3f.POSITIVE_Y.getDegreesQuaternion(effect.getPitch()));
         }
     }
 
@@ -35,16 +35,16 @@ public abstract class OrientedBillboardParticle extends AbstractBillboardParticl
 
     @Override
     protected void renderQuads(Tessellator te, BufferBuilder buffer, float x, float y, float z, float tickDelta) {
-        Vector3f[] corners = new Vector3f[]{
+        Vec3f[] corners = new Vec3f[]{
-                new Vector3f(-1, -1, 0),
+                new Vec3f(-1, -1, 0),
-                new Vector3f(-1,  1, 0),
+                new Vec3f(-1,  1, 0),
-                new Vector3f( 1,  1, 0),
+                new Vec3f( 1,  1, 0),
-                new Vector3f( 1, -1, 0)
+                new Vec3f( 1, -1, 0)
         };
         float scale = getScale(tickDelta);
 
         for(int k = 0; k < 4; ++k) {
-           Vector3f corner = corners[k];
+           Vec3f corner = corners[k];
            corner.rotate(rotation);
            corner.scale(scale);
            corner.add(x, y, z);

src/main/java/com/minelittlepony/unicopia/client/particle/RainbowTrailParticle.java

@@ -11,7 +11,7 @@ import com.minelittlepony.unicopia.particle.ParticleHandle.Link;
 import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.render.BufferBuilder;
 import net.minecraft.client.render.Tessellator;
-import net.minecraft.client.util.math.Vector3f;
+import net.minecraft.util.math.Vec3f;
 import net.minecraft.client.world.ClientWorld;
 import net.minecraft.particle.DefaultParticleType;
 import net.minecraft.util.Identifier;
@@ -60,11 +60,11 @@ public class RainbowTrailParticle extends AbstractBillboardParticle implements A
         float alpha = 1 - (float)age / maxAge;
 
         for (int i = 0; i < segments.size() - 1; i++) {
-            Vector3f[] corners = segments.get(i).getPlane(segments.get(i + 1));
+            Vec3f[] corners = segments.get(i).getPlane(segments.get(i + 1));
             float scale = getScale(tickDelta);
 
             for (int k = 0; k < 4; ++k) {
-               Vector3f corner = corners[k];
+               Vec3f corner = corners[k];
                corner.scale(scale);
                corner.add(x, y, z);
             }
@@ -107,14 +107,14 @@ public class RainbowTrailParticle extends AbstractBillboardParticle implements A
 
     private final class Segment {
         Vec3d position;
-        Vector3f offset;
+        Vec3f offset;
 
         int age;
         int maxAge;
 
         Segment(Vec3d position) {
             this.position = position;
-            this.offset = new Vector3f((float)(position.getX() - x), (float)(position.getY() - y), (float)(position.getZ() - z));
+            this.offset = new Vec3f((float)(position.getX() - x), (float)(position.getY() - y), (float)(position.getZ() - z));
             this.maxAge = 90;
         }
 
@@ -126,7 +126,7 @@ public class RainbowTrailParticle extends AbstractBillboardParticle implements A
             return segments.indexOf(this) < segments.size() - 1 && age++ >= maxAge;
         }
 
-        Vector3f[] getPlane(Segment to) {
+        Vec3f[] getPlane(Segment to) {
             float fromX = offset.getX();
             float toX = to.offset.getX();
 
@@ -139,11 +139,11 @@ public class RainbowTrailParticle extends AbstractBillboardParticle implements A
             float toTopY = to.offset.getY() + 1;
             float toBottomY = to.offset.getY();
 
-            return new Vector3f[]{
+            return new Vec3f[]{
-                    new Vector3f(fromX, fromBottomY, fromZ), // bottom left
+                    new Vec3f(fromX, fromBottomY, fromZ), // bottom left
-                    new Vector3f(fromX, fromTopY, fromZ), // top left
+                    new Vec3f(fromX, fromTopY, fromZ), // top left
-                    new Vector3f(toX, toTopY, toZ), // top right
+                    new Vec3f(toX, toTopY, toZ), // top right
-                    new Vector3f(toX, toBottomY, toZ)  // bottom right
+                    new Vec3f(toX, toBottomY, toZ)  // bottom right
             };
         }
     }

src/main/java/com/minelittlepony/unicopia/client/particle/RunesParticle.java

@@ -9,7 +9,7 @@ import com.mojang.blaze3d.systems.RenderSystem;
 
 import net.minecraft.client.render.BufferBuilder;
 import net.minecraft.client.render.Tessellator;
-import net.minecraft.client.util.math.Vector3f;
+import net.minecraft.util.math.Vec3f;
 import net.minecraft.client.world.ClientWorld;
 import net.minecraft.util.Identifier;
 import net.minecraft.util.math.MathHelper;
@@ -91,7 +91,7 @@ public class RunesParticle extends OrientedBillboardParticle implements Attachme
     }
 
     @Override
-    protected int getColorMultiplier(float tint) {
+    protected int getBrightness(float tint) {
         return 0xF000F0;
     }
 
@@ -105,22 +105,22 @@ public class RunesParticle extends OrientedBillboardParticle implements Attachme
         for (int i = 0; i < TEXTURES.length; i++) {
             bindTexture(TEXTURES[i]);
 
-            RenderSystem.color3f(colorRed, colorGreen, colorBlue);
+            RenderSystem.setShaderColor(colorRed, colorGreen, colorBlue, alpha);
 
-            Vector3f[] corners = new Vector3f[]{
+            Vec3f[] corners = new Vec3f[]{
-                    new Vector3f(-1, -1, 0),
+                    new Vec3f(-1, -1, 0),
-                    new Vector3f(-1,  1, 0),
+                    new Vec3f(-1,  1, 0),
-                    new Vector3f( 1,  1, 0),
+                    new Vec3f( 1,  1, 0),
-                    new Vector3f( 1, -1, 0)
+                    new Vec3f( 1, -1, 0)
             };
             float scale = getScale(tickDelta);
 
             float ringSpeed = (i % 2 == 0 ? i : -1) * i;
 
-            Quaternion ringAngle = Vector3f.POSITIVE_Z.getDegreesQuaternion(angle * ringSpeed);
+            Quaternion ringAngle = Vec3f.POSITIVE_Z.getDegreesQuaternion(angle * ringSpeed);
 
             for(int k = 0; k < 4; ++k) {
-               Vector3f corner = corners[k];
+               Vec3f corner = corners[k];
                corner.rotate(ringAngle);
                corner.rotate(rotation);
                corner.scale(scale);

src/main/java/com/minelittlepony/unicopia/client/particle/SphereModel.java

@@ -3,8 +3,8 @@ package com.minelittlepony.unicopia.client.particle;
 import net.minecraft.client.render.VertexConsumer;
 import net.minecraft.util.math.Matrix4f;
 import net.minecraft.client.util.math.MatrixStack;
-import net.minecraft.client.util.math.Vector3f;
+import net.minecraft.util.math.Vec3f;
-import net.minecraft.client.util.math.Vector4f;
+import net.minecraft.util.math.Vector4f;
 import net.minecraft.util.math.Quaternion;
 import net.minecraft.util.math.Vec3d;
 
@@ -21,9 +21,9 @@ public class SphereModel {
     }
 
     public void setRotation(float x, float y, float z) {
-        rotX = Vector3f.POSITIVE_X.getDegreesQuaternion(x);
+        rotX = Vec3f.POSITIVE_X.getDegreesQuaternion(x);
-        rotY = Vector3f.POSITIVE_Y.getDegreesQuaternion(y);
+        rotY = Vec3f.POSITIVE_Y.getDegreesQuaternion(y);
-        rotZ = Vector3f.POSITIVE_Z.getDegreesQuaternion(z);
+        rotZ = Vec3f.POSITIVE_Z.getDegreesQuaternion(z);
     }
 
     public void render(MatrixStack matrices, float scale, VertexConsumer vertexWriter, int light, int overlay, float r, float g, float b, float a) {

src/main/java/com/minelittlepony/unicopia/client/render/AmuletFeatureRenderer.java

@@ -4,8 +4,15 @@ import java.util.HashMap;
 import java.util.Map;
 
 import com.minelittlepony.unicopia.item.AmuletItem;
+
+import net.minecraft.client.model.Dilation;
 import net.minecraft.client.model.Model;
+import net.minecraft.client.model.ModelData;
 import net.minecraft.client.model.ModelPart;
+import net.minecraft.client.model.ModelPartBuilder;
+import net.minecraft.client.model.ModelPartData;
+import net.minecraft.client.model.ModelTransform;
+import net.minecraft.client.model.TexturedModelData;
 import net.minecraft.client.render.OverlayTexture;
 import net.minecraft.client.render.RenderLayer;
 import net.minecraft.client.render.VertexConsumer;
@@ -22,7 +29,7 @@ import net.minecraft.util.registry.Registry;
 
 public class AmuletFeatureRenderer<E extends LivingEntity> implements AccessoryFeatureRenderer.Feature<E> {
 
-    private final AmuletModel model = new AmuletModel(0.3F);
+    private final AmuletModel model;
 
     private final Map<Identifier, Identifier> textures = new HashMap<>();
 
@@ -30,6 +37,7 @@ public class AmuletFeatureRenderer<E extends LivingEntity> implements AccessoryF
 
     public AmuletFeatureRenderer(FeatureRendererContext<E, ? extends BipedEntityModel<E>> context) {
         this.context = context;
+        this.model = new AmuletModel(AmuletModel.getData(new Dilation(0.3F)).createModel());
     }
 
     @Override
@@ -49,22 +57,29 @@ public class AmuletFeatureRenderer<E extends LivingEntity> implements AccessoryF
 
     static class AmuletModel extends Model {
 
-        private final ModelPart torso;
+        private final ModelPart amulet;
 
-        public AmuletModel(float dilate) {
+        public AmuletModel(ModelPart tree) {
             super(RenderLayer::getEntityTranslucent);
-            torso = new ModelPart(this, 0, 0);
+            amulet = tree.getChild("amulet");
-            torso.addCuboid(-4, 0, -2, 8, 12, 4, dilate);
+        }
-            torso.setPivot(0, 0, 0);
+
+        public static TexturedModelData getData(Dilation dilation) {
+            ModelData data = new ModelData();
+            ModelPartData root = data.getRoot();
+
+            root.addChild("amulet", ModelPartBuilder.create().cuboid(-4, 0, -2, 8, 12, 4, dilation), ModelTransform.NONE);
+
+            return TexturedModelData.of(data, 64, 64);
         }
 
         public void setAngles(LivingEntity entity, BipedEntityModel<?> biped) {
-            torso.copyPositionAndRotation(biped.torso);
+            amulet.copyTransform(biped.body);
         }
 
         @Override
         public void render(MatrixStack matrices, VertexConsumer vertexConsumer, int i, int j, float f, float g, float h, float k) {
-            torso.render(matrices, vertexConsumer, i, j, f, g, h, k);
+            amulet.render(matrices, vertexConsumer, i, j, f, g, h, k);
         }
     }
 }

src/main/java/com/minelittlepony/unicopia/client/render/BraceletFeatureRenderer.java

@@ -4,8 +4,14 @@ import com.minelittlepony.common.util.Color;
 import com.minelittlepony.unicopia.item.FriendshipBraceletItem;
 import com.minelittlepony.unicopia.item.GlowableItem;
 
+import net.minecraft.client.model.Dilation;
 import net.minecraft.client.model.Model;
+import net.minecraft.client.model.ModelData;
 import net.minecraft.client.model.ModelPart;
+import net.minecraft.client.model.ModelPartBuilder;
+import net.minecraft.client.model.ModelPartData;
+import net.minecraft.client.model.ModelTransform;
+import net.minecraft.client.model.TexturedModelData;
 import net.minecraft.client.network.ClientPlayerEntity;
 import net.minecraft.client.render.OverlayTexture;
 import net.minecraft.client.render.RenderLayer;
@@ -13,6 +19,7 @@ import net.minecraft.client.render.VertexConsumer;
 import net.minecraft.client.render.VertexConsumerProvider;
 import net.minecraft.client.render.entity.feature.FeatureRendererContext;
 import net.minecraft.client.render.entity.model.BipedEntityModel;
+import net.minecraft.client.render.entity.model.EntityModelPartNames;
 import net.minecraft.client.render.item.ItemRenderer;
 import net.minecraft.client.util.math.MatrixStack;
 import net.minecraft.entity.EquipmentSlot;
@@ -27,13 +34,16 @@ public class BraceletFeatureRenderer<E extends LivingEntity> implements Accessor
 
     private static final Identifier TEXTURE = new Identifier("unicopia", "textures/models/armor/bracelet.png");
 
-    private final BraceletModel steveModel = new BraceletModel(0.3F, false);
+    private final BraceletModel steveModel;
-    private final BraceletModel alexModel = new BraceletModel(0.3F, true);
+    private final BraceletModel alexModel;
 
     private final FeatureRendererContext<E, ? extends BipedEntityModel<E>> context;
 
     public BraceletFeatureRenderer(FeatureRendererContext<E, ? extends BipedEntityModel<E>> context) {
         this.context = context;
+        Dilation dilation = new Dilation(0.3F);
+        steveModel = new BraceletModel(BraceletModel.getData(dilation, false).createModel(), false);
+        alexModel = new BraceletModel(BraceletModel.getData(dilation, true).createModel(), true);
     }
 
     @Override
@@ -74,19 +84,26 @@ public class BraceletFeatureRenderer<E extends LivingEntity> implements Accessor
 
         private final boolean alex;
 
-        public BraceletModel(float dilate, boolean alex) {
+        public BraceletModel(ModelPart tree, boolean alex) {
             super(RenderLayer::getEntityTranslucent);
             this.alex = alex;
-            rightArm = new ModelPart(this, 0, alex ? 6 : 0);
+            this.leftArm = tree.getChild(EntityModelPartNames.LEFT_ARM);
-            rightArm.addCuboid(-3, 7, -2, alex ? 3 : 4, 2, 4, dilate);
+            this.rightArm = tree.getChild(EntityModelPartNames.RIGHT_ARM);
-            leftArm = new ModelPart(this, 0, alex ? 6 : 0);
+        }
-            leftArm.mirror = true;
+
-            leftArm.addCuboid(-1, 7, -2, alex ? 3 : 4, 2, 4, dilate);
+        public static TexturedModelData getData(Dilation dilation, boolean alex) {
+            ModelData data = new ModelData();
+            ModelPartData root = data.getRoot();
+
+            root.addChild(EntityModelPartNames.RIGHT_ARM, ModelPartBuilder.create().uv(0, alex ? 6 : 0).cuboid(-3, 7, -2, alex ? 3 : 4, 2, 4, dilation), ModelTransform.NONE);
+            root.addChild(EntityModelPartNames.LEFT_ARM,  ModelPartBuilder.create().mirrored().uv(0, alex ? 6 : 0).cuboid(-1, 7, -2, alex ? 3 : 4, 2, 4, dilation), ModelTransform.NONE);
+
+            return TexturedModelData.of(data, 64, 64);
         }
 
         public void setAngles(BipedEntityModel<?> biped) {
-            leftArm.copyPositionAndRotation(biped.leftArm);
+            leftArm.copyTransform(biped.leftArm);
-            rightArm.copyPositionAndRotation(biped.rightArm);
+            rightArm.copyTransform(biped.rightArm);
             if (alex) {
                 rightArm.pivotX++;
             }

src/main/java/com/minelittlepony/unicopia/client/render/CastSpellEntityRenderer.java

@@ -2,16 +2,15 @@ package com.minelittlepony.unicopia.client.render;
 
 import com.minelittlepony.unicopia.entity.CastSpellEntity;
 
-import net.fabricmc.fabric.api.client.rendereregistry.v1.EntityRendererRegistry;
-import net.minecraft.client.render.entity.EntityRenderDispatcher;
 import net.minecraft.client.render.entity.EntityRenderer;
+import net.minecraft.client.render.entity.EntityRendererFactory;
 import net.minecraft.client.texture.SpriteAtlasTexture;
 import net.minecraft.util.Identifier;
 
 public class CastSpellEntityRenderer extends EntityRenderer<CastSpellEntity> {
 
-    public CastSpellEntityRenderer(EntityRenderDispatcher dispatcher, EntityRendererRegistry.Context context) {
+    public CastSpellEntityRenderer(EntityRendererFactory.Context ctx) {
-        super(dispatcher);
+        super(ctx);
     }
 
     @Override

src/main/java/com/minelittlepony/unicopia/client/render/FloatingArtefactEntityRenderer.java

@@ -3,27 +3,26 @@ package com.minelittlepony.unicopia.client.render;
 import com.minelittlepony.unicopia.entity.FloatingArtefactEntity;
 import com.minelittlepony.unicopia.item.UItems;
 
-import net.fabricmc.fabric.api.client.rendereregistry.v1.EntityRendererRegistry;
 import net.minecraft.client.render.OverlayTexture;
 import net.minecraft.client.render.VertexConsumerProvider;
-import net.minecraft.client.render.entity.EntityRenderDispatcher;
 import net.minecraft.client.render.entity.EntityRenderer;
+import net.minecraft.client.render.entity.EntityRendererFactory;
 import net.minecraft.client.render.item.ItemRenderer;
 import net.minecraft.client.render.model.BakedModel;
 import net.minecraft.client.render.model.json.ModelTransformation;
 import net.minecraft.client.texture.SpriteAtlasTexture;
 import net.minecraft.client.util.math.MatrixStack;
-import net.minecraft.client.util.math.Vector3f;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.Identifier;
+import net.minecraft.util.math.Vec3f;
 
 public class FloatingArtefactEntityRenderer extends EntityRenderer<FloatingArtefactEntity> {
 
     private final ItemRenderer itemRenderer;
 
-    public FloatingArtefactEntityRenderer(EntityRenderDispatcher manager, EntityRendererRegistry.Context context) {
+    public FloatingArtefactEntityRenderer(EntityRendererFactory.Context ctx) {
-        super(manager);
+        super(ctx);
-        itemRenderer = context.getItemRenderer();
+        itemRenderer = ctx.getItemRenderer();
     }
 
     @Override
@@ -35,7 +34,7 @@ public class FloatingArtefactEntityRenderer extends EntityRenderer<FloatingArtef
             stack = UItems.EMPTY_JAR.getDefaultStack();
         }
 
-        final BakedModel model = this.itemRenderer.getHeldItemModel(stack, entity.world, null);
+        final BakedModel model = this.itemRenderer.getHeldItemModel(stack, entity.world, null, 0);
 
         final float variance = 0.25F;
         final float verticalOffset = entity.getVerticalOffset(timeDelta);
@@ -46,7 +45,7 @@ public class FloatingArtefactEntityRenderer extends EntityRenderer<FloatingArtef
         transforms.push();
         transforms.scale(scale, scale, scale);
         transforms.translate(0, verticalOffset + variance * modelScaleY, 0);
-        transforms.multiply(Vector3f.POSITIVE_Y.getRadialQuaternion(entity.getRotation(timeDelta)));
+        transforms.multiply(Vec3f.POSITIVE_Y.getRadialQuaternion(entity.getRotation(timeDelta)));
 
         itemRenderer.renderItem(stack, ModelTransformation.Mode.GROUND, false, transforms, renderContext, lightUv, OverlayTexture.DEFAULT_UV, model);
 

src/main/java/com/minelittlepony/unicopia/client/render/RenderLayers.java

@@ -7,11 +7,12 @@ import com.mojang.blaze3d.systems.RenderSystem;
 import net.minecraft.client.render.RenderLayer;
 import net.minecraft.client.render.RenderPhase;
 import net.minecraft.client.render.VertexFormat;
+import net.minecraft.client.render.VertexFormat.DrawMode;
 import net.minecraft.client.render.VertexFormats;
 
 public final class RenderLayers extends RenderLayer {
 
-    private RenderLayers(String name, VertexFormat vertexFormat, int drawMode, int expectedBufferSize,
+    private RenderLayers(String name, VertexFormat vertexFormat, DrawMode drawMode, int expectedBufferSize,
             boolean hasCrumbling, boolean translucent, Runnable startAction, Runnable endAction) {
         super(name, vertexFormat, drawMode, expectedBufferSize, hasCrumbling, translucent, startAction, endAction);
     }
@@ -27,45 +28,35 @@ public final class RenderLayers extends RenderLayer {
     });
 
     public static RenderLayer getTintedTexturedLayer(float red, float green, float blue, float alpha) {
-        return RenderLayer.of("mlp_tint_layer", VertexFormats.POSITION_COLOR_TEXTURE_OVERLAY_LIGHT_NORMAL, 7, 256, true, true, RenderLayer.MultiPhaseParameters.builder()
+        return RenderLayer.of("mlp_tint_layer", VertexFormats.POSITION_COLOR_TEXTURE_OVERLAY_LIGHT_NORMAL, VertexFormat.DrawMode.QUADS, 256, true, true, RenderLayer.MultiPhaseParameters.builder()
                 .texture(new Color(red, green, blue, alpha))
+                .shader(EYES_SHADER)
                 .writeMaskState(COLOR_MASK)
-                .alpha(ONE_TENTH_ALPHA)
+                .depthTest(LEQUAL_DEPTH_TEST)
                 .transparency(GLOWING_TRANSPARENCY)
-                .shadeModel(SMOOTH_SHADE_MODEL)
                 .lightmap(DISABLE_LIGHTMAP)
                 .overlay(DISABLE_OVERLAY_COLOR)
                 .cull(DISABLE_CULLING)
                 .build(true));
     }
 
-    private static class Color extends Texture {
+    private static class Color extends TextureBase {
-
         private final float red;
         private final float green;
         private final float blue;
         private final float alpha;
 
         public Color(float red, float green, float blue, float alpha) {
-            super();
+            super(
+                    () -> RenderSystem.setShaderColor(red, green, blue, alpha),
+                    () -> RenderSystem.setShaderColor(1, 1, 1, 1)
+            );
             this.red = red;
             this.green = green;
             this.blue = blue;
             this.alpha = alpha;
         }
 
-        @Override
-        public void startDrawing() {
-            RenderSystem.blendColor(red, green, blue, alpha);
-            super.startDrawing();
-        }
-
-        @Override
-        public void endDrawing() {
-            super.endDrawing();
-            RenderSystem.blendColor(1, 1, 1, 1);
-        }
-
         @Override
         public boolean equals(Object other) {
             return super.equals(other)

src/main/java/com/minelittlepony/unicopia/client/render/WingsFeatureRenderer.java

@@ -3,8 +3,14 @@ package com.minelittlepony.unicopia.client.render;
 import com.minelittlepony.unicopia.entity.player.Pony;
 import com.minelittlepony.unicopia.item.UItems;
 
+import net.minecraft.client.model.Dilation;
 import net.minecraft.client.model.Model;
+import net.minecraft.client.model.ModelData;
 import net.minecraft.client.model.ModelPart;
+import net.minecraft.client.model.ModelPartBuilder;
+import net.minecraft.client.model.ModelPartData;
+import net.minecraft.client.model.ModelTransform;
+import net.minecraft.client.model.TexturedModelData;
 import net.minecraft.client.render.OverlayTexture;
 import net.minecraft.client.render.RenderLayer;
 import net.minecraft.client.render.VertexConsumer;
@@ -23,12 +29,13 @@ public class WingsFeatureRenderer<E extends LivingEntity> implements AccessoryFe
     private static final Identifier ICARUS_WINGS_CORRUPTED = new Identifier("unicopia", "textures/models/wings/icarus_corrupted.png");
     private static final Identifier PEGASUS_WINGS = new Identifier("unicopia", "textures/models/wings/pegasus.png");
 
-    private final WingsModel model = new WingsModel();
+    private final WingsModel model;
 
     private final FeatureRendererContext<E, ? extends BipedEntityModel<E>> context;
 
     public WingsFeatureRenderer(FeatureRendererContext<E, ? extends BipedEntityModel<E>> context) {
         this.context = context;
+        this.model = new WingsModel(WingsModel.getData(Dilation.NONE).createModel());
     }
 
     @Override
@@ -51,19 +58,24 @@ public class WingsFeatureRenderer<E extends LivingEntity> implements AccessoryFe
         private final ModelPart root;
         private final Wing[] wings;
 
-        public WingsModel() {
+        public WingsModel(ModelPart tree) {
             super(RenderLayer::getEntityTranslucent);
-            this.textureHeight = 23;
+            root = tree;
-            this.textureWidth = 24;
-            root = new ModelPart(this, 0, 0);
             wings = new Wing[] {
-                    new Wing(this, root, -1),
+                    new Wing(tree.getChild("left_wing"), -1),
-                    new Wing(this, root, 1)
+                    new Wing(tree.getChild("right_wing"), 1)
             };
         }
 
+        static TexturedModelData getData(Dilation dilation) {
+            ModelData data = new ModelData();
+            Wing.getData("left_wing", data.getRoot(), dilation, -1);
+            Wing.getData("right_wing", data.getRoot(), dilation, 1);
+            return TexturedModelData.of(data, 24, 23);
+        }
+
         public void setAngles(LivingEntity entity, BipedEntityModel<?> biped) {
-            root.copyPositionAndRotation(biped.torso);
+            root.copyTransform(biped.body);
             for (Wing wing : wings) {
                 wing.setAngles(entity);
             }
@@ -75,36 +87,36 @@ public class WingsFeatureRenderer<E extends LivingEntity> implements AccessoryFe
         }
 
         static class Wing {
-            ModelPart base;
+            final ModelPart base;
 
-            ModelPart[] feathers;
+            final ModelPart[] feathers = new ModelPart[8];
 
-            int k;
+            final int k;
 
-            Wing(Model model, ModelPart torso, int k) {
+            Wing(ModelPart tree, int k) {
                 this.k = k;
-                base = new ModelPart(model, 0, 0);
+                base = tree;
-
-                base.setPivot(k * 2, 2, 2 + k * 0.5F);
-                base.addCuboid(0, 0, 0, 2, 10, 2);
-
-                feathers = new ModelPart[8];
-
                 for (int i = 0; i < feathers.length; i++) {
-                    int texX = (i % 2) * 8;
+                    feathers[i] = base.getChild("feather_" + i);
-
-                    ModelPart feather = new ModelPart(model, 8 + texX, 0);
-                    feather.setPivot(0, 9, 0);
-
-                    int featherLength = 21 - i * 2;
-
-                    feather.addCuboid(-k * (i % 2) / 90F, 0, 0, 2, featherLength, 2);
-
-                    base.addChild(feather);
-                    feathers[i] = feather;
                 }
+            }
 
-                torso.addChild(base);
+            static void getData(String name, ModelPartData parent, Dilation dilation, int k) {
+                ModelPartData base = parent.addChild(name,
+                        ModelPartBuilder.create().cuboid(0, 0, 0, 2, 10, 2, dilation),
+                        ModelTransform.pivot(k * 2, 2, 2 + k * 0.5F));
+
+                int featherCount = 8;
+
+                for (int i = 0; i < featherCount; i++) {
+                    int texX = (i % 2) * 8;
+                    int featherLength = 21 - i * 2;
+                    base.addChild("feather_" + i,
+                            ModelPartBuilder.create()
+                                .uv(8 + texX, 0)
+                                .cuboid(-k * (i % 2) / 90F, 0, 0, 2, featherLength, 2, dilation),
+                            ModelTransform.pivot(0, 9, 0));
+                }
             }
 
             void setAngles(LivingEntity entity) {

src/main/java/com/minelittlepony/unicopia/client/render/WorldRenderDelegate.java

@@ -1,6 +1,6 @@
 package com.minelittlepony.unicopia.client.render;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
 import com.minelittlepony.unicopia.ability.magic.spell.SpellType;
@@ -9,6 +9,7 @@ import com.minelittlepony.unicopia.entity.ItemImpl;
 import com.minelittlepony.unicopia.entity.Living;
 import com.minelittlepony.unicopia.entity.behaviour.Disguise;
 import com.minelittlepony.unicopia.entity.player.Pony;
+import com.minelittlepony.unicopia.mixin.MixinBlockEntity;
 
 import net.minecraft.block.BlockState;
 import net.minecraft.block.entity.BlockEntity;
@@ -16,14 +17,13 @@ import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.model.Model;
 import net.minecraft.client.render.OverlayTexture;
 import net.minecraft.client.render.VertexConsumerProvider;
-import net.minecraft.client.render.block.entity.BlockEntityRenderDispatcher;
 import net.minecraft.client.render.block.entity.BlockEntityRenderer;
 import net.minecraft.client.render.entity.EntityRenderDispatcher;
 import net.minecraft.client.render.entity.EntityRenderer;
 import net.minecraft.client.render.entity.LivingEntityRenderer;
 import net.minecraft.client.render.entity.model.BipedEntityModel;
 import net.minecraft.client.util.math.MatrixStack;
-import net.minecraft.client.util.math.Vector3f;
+import net.minecraft.util.math.Vec3f;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.player.PlayerEntity;
@@ -71,8 +71,8 @@ public class WorldRenderDelegate {
         roll = pony instanceof Pony ? ((Pony)pony).getInterpolator().interpolate("g_roll", roll, 15) : roll;
 
         matrices.translate(x, y + owner.getHeight() / 2, z);
-        matrices.multiply(Vector3f.POSITIVE_X.getDegreesQuaternion(roll));
+        matrices.multiply(Vec3f.POSITIVE_X.getDegreesQuaternion(roll));
-        matrices.multiply(Vector3f.POSITIVE_Y.getDegreesQuaternion(roll));
+        matrices.multiply(Vec3f.POSITIVE_Y.getDegreesQuaternion(roll));
         matrices.translate(-x, -y - owner.getHeight() / 2, -z);
 
         if (negative) {
@@ -132,9 +132,9 @@ public class WorldRenderDelegate {
         BlockEntity blockEntity = ve.getBlockEntity();
 
         if (blockEntity != null) {
-            BlockEntityRenderer<BlockEntity> r = BlockEntityRenderDispatcher.INSTANCE.get(blockEntity);
+            BlockEntityRenderer<BlockEntity> r = MinecraftClient.getInstance().getBlockEntityRenderDispatcher().get(blockEntity);
             if (r != null) {
-                blockEntity.setPos(e.getBlockPos());
+                ((MixinBlockEntity)blockEntity).setPos(e.getBlockPos());
                 matrices.push();
 
                 BlockState state = blockEntity.getCachedState();
@@ -143,7 +143,7 @@ public class WorldRenderDelegate {
                 matrices.translate(x, y, z);
 
                 matrices.multiply(direction.getRotationQuaternion());
-                matrices.multiply(Vector3f.NEGATIVE_X.getDegreesQuaternion(90));
+                matrices.multiply(Vec3f.NEGATIVE_X.getDegreesQuaternion(90));
 
                 matrices.translate(-0.5, 0, -0.5);
 
@@ -161,7 +161,7 @@ public class WorldRenderDelegate {
         }
 
         e.setFireTicks(fireTicks);
-        dispatcher.render(e, x, y, z, e.yaw, tickDelta, matrices, vertexConsumers, light);
+        dispatcher.render(e, x, y, z, e.getYaw(), tickDelta, matrices, vertexConsumers, light);
         e.setFireTicks(0);
 
         if (model != null) {
@@ -184,10 +184,10 @@ public class WorldRenderDelegate {
     private void flipAngles(Entity entity) {
         if (entity instanceof PlayerEntity) {
             entity.prevYaw *= -1;
-            entity.yaw *= -1;
+            entity.setYaw(entity.getYaw() * -1);
 
             entity.prevPitch *= -1;
-            entity.pitch *= -1;
+            entity.setPitch(entity.getPitch() * -1);
         }
 
         if (entity instanceof LivingEntity) {

src/main/java/com/minelittlepony/unicopia/client/sound/MagicAuraSoundInstance.java

@@ -45,7 +45,7 @@ public class MagicAuraSoundInstance extends MovingSoundInstance {
         y = pos.y;
         z = pos.z;
 
-        if (!living.getEntity().removed && data.isPresent()) {
+        if (!living.getEntity().isRemoved() && data.isPresent()) {
             float level = data.get().level;
             if (level != targetVolume) {
                 setTargetVolume(level);

src/main/java/com/minelittlepony/unicopia/command/DisguiseCommand.java

@@ -11,12 +11,12 @@ import com.mojang.brigadier.exceptions.CommandSyntaxException;
 import com.mojang.brigadier.exceptions.SimpleCommandExceptionType;
 
 import net.minecraft.command.argument.EntitySummonArgumentType;
-import net.minecraft.command.argument.NbtCompoundTagArgumentType;
+import net.minecraft.command.argument.NbtCompoundArgumentType;
 import net.minecraft.command.suggestion.SuggestionProviders;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityType;
 import net.minecraft.entity.player.PlayerEntity;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.server.command.CommandManager;
 import net.minecraft.server.command.ServerCommandSource;
 import net.minecraft.text.TranslatableText;
@@ -38,18 +38,18 @@ public class DisguiseCommand {
                 .executes(context -> disguise(context.getSource(),
                         context.getSource().getPlayer(),
                         EntitySummonArgumentType.getEntitySummon(context, "entity"),
-                        new CompoundTag(), true))
+                        new NbtCompound(), true))
-         .then(CommandManager.argument("nbt", NbtCompoundTagArgumentType.nbtCompound())
+         .then(CommandManager.argument("nbt", NbtCompoundArgumentType.nbtCompound())
                 .executes(context -> disguise(context.getSource(),
                         context.getSource().getPlayer(),
                         EntitySummonArgumentType.getEntitySummon(context, "entity"),
-                        NbtCompoundTagArgumentType.getCompoundTag(context, "nbt"), false))
+                        NbtCompoundArgumentType.getNbtCompound(context, "nbt"), false))
          ));
 
         dispatcher.register(builder);
     }
 
-    static int disguise(ServerCommandSource source, PlayerEntity player, Identifier id, CompoundTag nbt, boolean isSelf) throws CommandSyntaxException {
+    static int disguise(ServerCommandSource source, PlayerEntity player, Identifier id, NbtCompound nbt, boolean isSelf) throws CommandSyntaxException {
         nbt = nbt.copy();
         nbt.putString("id", id.toString());
 

src/main/java/com/minelittlepony/unicopia/entity/CastSpellEntity.java

@@ -19,7 +19,7 @@ import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.data.DataTracker;
 import net.minecraft.entity.data.TrackedData;
 import net.minecraft.entity.data.TrackedDataHandlerRegistry;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.network.Packet;
 import net.minecraft.text.Text;
 import net.minecraft.text.TranslatableText;
@@ -66,7 +66,7 @@ public class CastSpellEntity extends Entity implements Caster<LivingEntity> {
     public void tick() {
         super.tick();
 
-        if (removed) {
+        if (isRemoved()) {
             return;
         }
 
@@ -83,11 +83,11 @@ public class CastSpellEntity extends Entity implements Caster<LivingEntity> {
         }
         LivingEntity master = getMaster();
 
-        if (master == null || master.removed) {
+        if (master == null || master.isRemoved()) {
             if (orphanedTicks-- > 0) {
                 return;
             }
-            remove();
+            remove(RemovalReason.DISCARDED);
             return;
         }
 
@@ -104,13 +104,13 @@ public class CastSpellEntity extends Entity implements Caster<LivingEntity> {
 
             return true;
         }).isPresent()) {
-            remove();
+            remove(RemovalReason.DISCARDED);
         }
     }
 
     @Override
-    public void remove() {
+    public void remove(RemovalReason reason) {
-        super.remove();
+        super.remove(reason);
         if (world.isClient) {
             world.getLightingProvider().checkBlock(getBlockPos());
         }
@@ -162,7 +162,7 @@ public class CastSpellEntity extends Entity implements Caster<LivingEntity> {
     }
 
     @Override
-    protected void writeCustomDataToTag(CompoundTag tag) {
+    protected void writeCustomDataToNbt(NbtCompound tag) {
         tag.put("owner", owner.toNBT());
         dataTracker.get(SPELL).ifPresent(spellId -> {
             tag.putUuid("spellId", spellId);
@@ -171,7 +171,7 @@ public class CastSpellEntity extends Entity implements Caster<LivingEntity> {
     }
 
     @Override
-    protected void readCustomDataFromTag(CompoundTag tag) {
+    protected void readCustomDataFromNbt(NbtCompound tag) {
         if (tag.contains("owner")) {
             owner.fromNBT(tag.getCompound("owner"));
         }

src/main/java/com/minelittlepony/unicopia/entity/Creature.java

@@ -20,11 +20,11 @@ import net.minecraft.entity.data.DataTracker;
 import net.minecraft.entity.data.TrackedData;
 import net.minecraft.entity.data.TrackedDataHandlerRegistry;
 import net.minecraft.entity.mob.MobEntity;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 
 public class Creature extends Living<LivingEntity> {
 
-    private static final TrackedData<CompoundTag> EFFECT = DataTracker.registerData(LivingEntity.class, TrackedDataHandlerRegistry.TAG_COMPOUND);
+    private static final TrackedData<NbtCompound> EFFECT = DataTracker.registerData(LivingEntity.class, TrackedDataHandlerRegistry.TAG_COMPOUND);
     public static final TrackedData<Float> GRAVITY = DataTracker.registerData(LivingEntity.class, TrackedDataHandlerRegistry.FLOAT);
 
     private static final LevelStore LEVELS = Levelled.fixed(0);
@@ -94,7 +94,7 @@ public class Creature extends Living<LivingEntity> {
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         super.toNBT(compound);
         getSpellSlot().get(true).ifPresent(effect -> {
             compound.put("effect", SpellType.toNBT(effect));
@@ -103,7 +103,7 @@ public class Creature extends Living<LivingEntity> {
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         super.fromNBT(compound);
         if (compound.contains("effect")) {
             setSpell(SpellType.fromNBT(compound.getCompound("effect")));

src/main/java/com/minelittlepony/unicopia/entity/Enchantments.java

@@ -7,19 +7,19 @@ import java.util.Optional;
 import java.util.Set;
 import java.util.function.Supplier;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.item.enchantment.SimpleEnchantment;
 import com.minelittlepony.unicopia.item.enchantment.UEnchantments;
 import com.minelittlepony.unicopia.util.NbtSerialisable;
+import com.minelittlepony.unicopia.util.Tickable;
 
 import net.minecraft.enchantment.Enchantment;
 import net.minecraft.enchantment.EnchantmentHelper;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
-import net.minecraft.nbt.ListTag;
+import net.minecraft.nbt.NbtList;
-import net.minecraft.nbt.StringTag;
+import net.minecraft.nbt.NbtString;
 import net.minecraft.util.Identifier;
-import net.minecraft.util.Tickable;
 import net.minecraft.util.registry.Registry;
 
 public class Enchantments implements NbtSerialisable, Tickable {
@@ -74,19 +74,19 @@ public class Enchantments implements NbtSerialisable, Tickable {
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
-        ListTag list = new ListTag();
+        NbtList list = new NbtList();
         equippedEnchantments.forEach(enchant -> {
             Identifier id = Registry.ENCHANTMENT.getId(enchant);
             if (id != null) {
-                list.add(StringTag.of(id.toString()));
+                list.add(NbtString.of(id.toString()));
             }
         });
         compound.put("enchants", list);
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         equippedEnchantments.clear();
         if (compound.contains("enchants")) {
             compound.getList("enchants", 8).forEach(tag -> {

src/main/java/com/minelittlepony/unicopia/entity/EntityPhysics.java

@@ -2,8 +2,8 @@ package com.minelittlepony.unicopia.entity;
 
 import com.minelittlepony.unicopia.entity.player.PlayerAttributes;
 import com.minelittlepony.unicopia.util.Copieable;
+import com.minelittlepony.unicopia.util.Tickable;
 
-import net.minecraft.block.Block;
 import net.minecraft.block.BlockRenderType;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.FenceGateBlock;
@@ -12,11 +12,10 @@ import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.damage.DamageSource;
 import net.minecraft.entity.data.TrackedData;
 import net.minecraft.entity.mob.MobEntity;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.particle.BlockStateParticleEffect;
 import net.minecraft.particle.ParticleTypes;
 import net.minecraft.tag.BlockTags;
-import net.minecraft.util.Tickable;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.MathHelper;
 import net.minecraft.util.math.Vec3d;
@@ -97,8 +96,8 @@ public class EntityPhysics<T extends Entity> implements Physics, Copieable<Entit
 
         if (entity.world.getBlockState(pos).isAir()) {
             BlockPos below = pos.down();
-            Block block = entity.world.getBlockState(below).getBlock();
+            BlockState block = entity.world.getBlockState(below);
-            if (block.isIn(BlockTags.FENCES) || block.isIn(BlockTags.WALLS) || block instanceof FenceGateBlock) {
+            if (block.isIn(BlockTags.FENCES) || block.isIn(BlockTags.WALLS) || block.getBlock() instanceof FenceGateBlock) {
                 entity.setOnGround(true);
                 return below;
             }
@@ -158,12 +157,12 @@ public class EntityPhysics<T extends Entity> implements Physics, Copieable<Entit
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         compound.putFloat("gravity", getBaseGravityModifier());
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         setBaseGravityModifier(compound.getFloat("gravity"));
     }
 

src/main/java/com/minelittlepony/unicopia/entity/EntityReference.java

@@ -4,12 +4,12 @@ import java.util.Optional;
 import java.util.UUID;
 import java.util.function.Consumer;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.util.NbtSerialisable;
 
 import net.minecraft.entity.Entity;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.server.world.ServerWorld;
 import net.minecraft.util.math.Vec3d;
 import net.minecraft.world.World;
@@ -24,7 +24,7 @@ public class EntityReference<T extends Entity> implements NbtSerialisable {
     public void set(@Nullable T entity) {
         if (entity != null) {
             uuid = entity.getUuid();
-            clientId = entity.getEntityId();
+            clientId = entity.getId();
             pos = Optional.of(entity.getPos());
         }
     }
@@ -35,7 +35,7 @@ public class EntityReference<T extends Entity> implements NbtSerialisable {
 
     public boolean isPresent(World world) {
         T entity = get(world);
-        return entity != null && !entity.removed;
+        return entity != null && !entity.isRemoved();
     }
 
     public void ifPresent(World world, Consumer<T> consumer) {
@@ -59,7 +59,7 @@ public class EntityReference<T extends Entity> implements NbtSerialisable {
     }
 
     @Override
-    public void toNBT(CompoundTag tag) {
+    public void toNBT(NbtCompound tag) {
         if (uuid != null) {
             tag.putUuid("uuid", uuid);
         }
@@ -70,7 +70,7 @@ public class EntityReference<T extends Entity> implements NbtSerialisable {
     }
 
     @Override
-    public void fromNBT(CompoundTag tag) {
+    public void fromNBT(NbtCompound tag) {
         uuid = tag.containsUuid("uuid") ? tag.getUuid("uuid") : null;
         pos = tag.contains("pos") ? Optional.ofNullable(NbtSerialisable.readVector(tag.getList("pos", 6))) : Optional.empty();
         clientId = tag.getInt("clientId");

src/main/java/com/minelittlepony/unicopia/entity/Equine.java

@@ -2,16 +2,16 @@ package com.minelittlepony.unicopia.entity;
 
 import java.util.Optional;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.Race;
 import com.minelittlepony.unicopia.projectile.ProjectileImpactListener;
 import com.minelittlepony.unicopia.util.NbtSerialisable;
+import com.minelittlepony.unicopia.util.Tickable;
 
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.damage.DamageSource;
 import net.minecraft.entity.projectile.ProjectileEntity;
-import net.minecraft.util.Tickable;
 
 public interface Equine<T extends Entity> extends NbtSerialisable, Tickable, ProjectileImpactListener {
     Race getSpecies();

src/main/java/com/minelittlepony/unicopia/entity/FloatingArtefactEntity.java

@@ -11,7 +11,7 @@ import net.minecraft.entity.data.DataTracker;
 import net.minecraft.entity.data.TrackedData;
 import net.minecraft.entity.data.TrackedDataHandlerRegistry;
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.network.Packet;
 import net.minecraft.sound.SoundEvents;
 import net.minecraft.util.ActionResult;
@@ -142,17 +142,17 @@ public class FloatingArtefactEntity extends Entity {
     }
 
     @Override
-    protected void readCustomDataFromTag(CompoundTag compound) {
+    protected void readCustomDataFromNbt(NbtCompound compound) {
-        ItemStack itemStack = ItemStack.fromTag(compound.getCompound("Item"));
+        ItemStack itemStack = ItemStack.fromNbt(compound.getCompound("Item"));
         setStack(itemStack);
         setState(State.valueOf(compound.getInt("State")));
     }
 
     @Override
-    protected void writeCustomDataToTag(CompoundTag compound) {
+    protected void writeCustomDataToNbt(NbtCompound compound) {
         ItemStack stack = getStack();
         if (!stack.isEmpty()) {
-            compound.put("Item", stack.toTag(new CompoundTag()));
+            compound.put("Item", stack.writeNbt(new NbtCompound()));
         }
         compound.putInt("State", getState().ordinal());
     }
@@ -167,7 +167,7 @@ public class FloatingArtefactEntity extends Entity {
 
         health -= amount;
         if (health <= 0) {
-            remove();
+            remove(RemovalReason.KILLED);
 
             ItemStack stack = getStack();
 

src/main/java/com/minelittlepony/unicopia/entity/ItemImpl.java

@@ -18,7 +18,7 @@ import net.minecraft.entity.data.TrackedDataHandlerRegistry;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.particle.ParticleEffect;
 import net.minecraft.particle.ParticleTypes;
 import net.minecraft.util.ActionResult;
@@ -91,14 +91,14 @@ public class ItemImpl implements Equine<ItemEntity>, Owned<ItemEntity> {
                     });
             }
 
-            if (stack.getItem().isIn(UTags.FALLS_SLOWLY)) {
+            if (stack.isIn(UTags.FALLS_SLOWLY)) {
                 if (!owner.isOnGround() && Math.signum(owner.getVelocity().y) != getPhysics().getGravitySignum()) {
                     double ticks = ((Entity)owner).age;
                     double shift = Math.sin(ticks / 9D) / 9D;
                     double rise = -Math.cos(ticks / 9D) * getPhysics().getGravitySignum();
 
                     owner.prevYaw = owner.prevYaw;
-                    owner.yaw += 0.3F;
+                    owner.setYaw(owner.getYaw() + 0.3F);
 
                     owner.setVelocity(
                             owner.getVelocity()
@@ -139,13 +139,13 @@ public class ItemImpl implements Equine<ItemEntity>, Owned<ItemEntity> {
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         compound.putString("owner_species", getSpecies().name());
         physics.toNBT(compound);
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         setSpecies(Race.fromName(compound.getString("owner_species")));
         physics.fromNBT(compound);
     }

src/main/java/com/minelittlepony/unicopia/entity/ItemPhysics.java

@@ -1,6 +1,5 @@
 package com.minelittlepony.unicopia.entity;
 
-import net.minecraft.entity.Entity;
 import net.minecraft.entity.ItemEntity;
 
 class ItemPhysics extends EntityPhysics<ItemEntity> {
@@ -22,7 +21,7 @@ class ItemPhysics extends EntityPhysics<ItemEntity> {
             );
 
             if (!entity.isOnGround()
-                    || Entity.squaredHorizontalLength(entity.getVelocity()) > 9.999999747378752E-6D) {
+                    || entity.getVelocity().horizontalLengthSquared() > 9.999999747378752E-6D) {
 
                 float above = 0.98f;
                 if (entity.verticalCollision) {

src/main/java/com/minelittlepony/unicopia/entity/Living.java

@@ -3,7 +3,7 @@ package com.minelittlepony.unicopia.entity;
 import java.util.Optional;
 import java.util.stream.Stream;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
 import com.minelittlepony.unicopia.ability.magic.SpellContainer;
@@ -20,7 +20,7 @@ import net.minecraft.entity.damage.DamageSource;
 import net.minecraft.entity.data.TrackedData;
 import net.minecraft.entity.projectile.ProjectileEntity;
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.util.Hand;
 
 public abstract class Living<T extends LivingEntity> implements Equine<T>, Caster<T> {
@@ -42,11 +42,11 @@ public abstract class Living<T extends LivingEntity> implements Equine<T>, Caste
 
     private final Enchantments enchants = new Enchantments(this);
 
-    protected Living(T entity, TrackedData<CompoundTag> effect) {
+    protected Living(T entity, TrackedData<NbtCompound> effect) {
         this.entity = entity;
         this.effectDelegate = new EffectSync(this, effect);
 
-        entity.getDataTracker().startTracking(effect, new CompoundTag());
+        entity.getDataTracker().startTracking(effect, new NbtCompound());
     }
 
     public void waitForFall(Runnable action) {
@@ -164,19 +164,19 @@ public abstract class Living<T extends LivingEntity> implements Equine<T>, Caste
                 .isPresent();
     }
 
-    protected void handleFall(float distance, float damageMultiplier) {
+    protected void handleFall(float distance, float damageMultiplier, DamageSource cause) {
         getSpellSlot().get(SpellType.DISGUISE, false).ifPresent(spell -> {
-            spell.getDisguise().onImpact(this, distance, damageMultiplier);
+            spell.getDisguise().onImpact(this, distance, damageMultiplier, cause);
         });
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         enchants.toNBT(compound);
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         enchants.fromNBT(compound);
     }
 }

src/main/java/com/minelittlepony/unicopia/entity/PonyContainer.java

@@ -2,7 +2,7 @@ package com.minelittlepony.unicopia.entity;
 
 import java.util.Optional;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import net.minecraft.entity.Entity;
 

src/main/java/com/minelittlepony/unicopia/entity/ai/BreakHeartGoal.java

@@ -28,7 +28,7 @@ public class BreakHeartGoal extends Goal {
     }
 
     protected boolean canTarget(Entity e) {
-        return !e.removed
+        return !e.isRemoved()
                 && e instanceof FloatingArtefactEntity
                 && ((FloatingArtefactEntity)e).getStack().getItem() == UItems.CRYSTAL_HEART
                 && mob.getVisibilityCache().canSee(e);

src/main/java/com/minelittlepony/unicopia/entity/ai/DynamicTargetGoal.java

@@ -5,7 +5,7 @@ import java.util.Optional;
 import java.util.function.Predicate;
 import java.util.function.Supplier;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.util.VecHelper;
 

src/main/java/com/minelittlepony/unicopia/entity/ai/WantItTakeItGoal.java

@@ -8,6 +8,7 @@ import com.minelittlepony.unicopia.particle.ParticleUtils;
 import com.minelittlepony.unicopia.particle.UParticles;
 import net.minecraft.enchantment.EnchantmentHelper;
 import net.minecraft.entity.Entity;
+import net.minecraft.entity.Entity.RemovalReason;
 import net.minecraft.entity.EquipmentSlot;
 import net.minecraft.entity.ItemEntity;
 import net.minecraft.entity.LivingEntity;
@@ -18,7 +19,7 @@ import net.minecraft.util.Hand;
 
 public class WantItTakeItGoal extends BreakHeartGoal {
 
-    private final TargetPredicate predicate = new TargetPredicate()
+    private final TargetPredicate predicate = TargetPredicate.createAttackable()
             .setBaseMaxDistance(64)
             .setPredicate(EquinePredicates.HAS_WANT_IT_NEED_IT);
 
@@ -30,7 +31,7 @@ public class WantItTakeItGoal extends BreakHeartGoal {
 
     @Override
     protected boolean canTarget(Entity e) {
-        return (!e.removed && e instanceof ItemEntity && EnchantmentHelper.getLevel(UEnchantments.WANT_IT_NEED_IT, ((ItemEntity)e).getStack()) > 0)
+        return (!e.isRemoved() && e instanceof ItemEntity && EnchantmentHelper.getLevel(UEnchantments.WANT_IT_NEED_IT, ((ItemEntity)e).getStack()) > 0)
             || (e instanceof LivingEntity && predicate.test(mob, (LivingEntity)e));
     }
 
@@ -78,11 +79,11 @@ public class WantItTakeItGoal extends BreakHeartGoal {
                     ItemEntity item = (ItemEntity)target;
                     ItemStack stack = item.getStack();
 
-                    if (!item.removed) {
+                    if (!item.isRemoved()) {
                         mob.tryEquip(stack);
-                        mob.method_29499(item);
+                        mob.triggerItemPickedUpByEntityCriteria(item);
                         mob.sendPickup(item, stack.getCount());
-                        item.remove();
+                        item.remove(RemovalReason.DISCARDED);
                     }
                 }, 0);
             }

src/main/java/com/minelittlepony/unicopia/entity/behaviour/ChickenBehaviour.java

@@ -35,9 +35,9 @@ public class ChickenBehaviour extends EntityBehaviour<ChickenEntity> {
                     if (egg.isEmpty()) {
                         egg = new ItemStack(Items.EGG);
 
-                        int slot = player.getMaster().inventory.method_7371(egg);
+                        int slot = player.getMaster().getInventory().indexOf(egg);
                         if (slot > -1) {
-                            player.getMaster().inventory.removeStack(slot, 1);
+                            player.getMaster().getInventory().removeStack(slot, 1);
                             entity.playSound(SoundEvents.ENTITY_CHICKEN_EGG,
                                     1,
                                     (entity.world.random.nextFloat() - entity.world.random.nextFloat()) * 0.2F + 4
@@ -54,7 +54,7 @@ public class ChickenBehaviour extends EntityBehaviour<ChickenEntity> {
 
         Entity src = source.getEntity();
 
-        if (src.isOnGround() || src instanceof PlayerEntity && ((PlayerEntity)src).abilities.flying) {
+        if (src.isOnGround() || src instanceof PlayerEntity && ((PlayerEntity)src).getAbilities().flying) {
             return;
         }
 

src/main/java/com/minelittlepony/unicopia/entity/behaviour/Disguise.java

@@ -7,8 +7,8 @@ import java.util.UUID;
 import java.util.function.Consumer;
 import java.util.function.Predicate;
 
-import javax.annotation.Nonnull;
+import org.jetbrains.annotations.NotNull;
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.FlightType;
 import com.minelittlepony.unicopia.InteractionManager;
@@ -31,6 +31,7 @@ import net.minecraft.entity.FallingBlockEntity;
 import net.minecraft.entity.Flutterer;
 import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.boss.dragon.EnderDragonEntity;
+import net.minecraft.entity.damage.DamageSource;
 import net.minecraft.entity.decoration.AbstractDecorationEntity;
 import net.minecraft.entity.mob.AmbientEntity;
 import net.minecraft.entity.mob.FlyingEntity;
@@ -39,7 +40,7 @@ import net.minecraft.entity.mob.SpiderEntity;
 import net.minecraft.entity.mob.VexEntity;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.entity.projectile.ShulkerBulletEntity;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.util.function.BooleanBiFunction;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Box;
@@ -49,7 +50,7 @@ import net.minecraft.world.WorldAccess;
 
 public class Disguise implements NbtSerialisable {
 
-    @Nonnull
+    @NotNull
     private String entityId = "";
 
     @Nullable
@@ -63,7 +64,7 @@ public class Disguise implements NbtSerialisable {
     private Optional<EntityDimensions> dimensions = Optional.empty();
 
     @Nullable
-    private CompoundTag entityNbt;
+    private NbtCompound entityNbt;
 
     @Nullable
     public Entity getAppearance() {
@@ -110,12 +111,12 @@ public class Disguise implements NbtSerialisable {
         }
     }
 
-    private synchronized void createPlayer(CompoundTag nbt, GameProfile profile, Caster<?> source) {
+    private synchronized void createPlayer(NbtCompound nbt, GameProfile profile, Caster<?> source) {
         remove();
 
         entity = InteractionManager.instance().createPlayer(source.getEntity(), profile);
         entity.setCustomName(source.getMaster().getName());
-        ((PlayerEntity)entity).fromTag(nbt.getCompound("playerNbt"));
+        ((PlayerEntity)entity).readNbt(nbt.getCompound("playerNbt"));
         entity.setUuid(UUID.randomUUID());
         entity.extinguish();
 
@@ -124,7 +125,7 @@ public class Disguise implements NbtSerialisable {
 
     public Entity getOrCreate(Caster<?> source) {
         if (entity == null && entityNbt != null) {
-            CompoundTag nbt = entityNbt;
+            NbtCompound nbt = entityNbt;
             entityNbt = null;
             attachments.clear();
 
@@ -133,16 +134,14 @@ public class Disguise implements NbtSerialisable {
                         nbt.getUuid("playerId"),
                         nbt.getString("playerName")
                     ), source);
-                new Thread(() -> createPlayer(nbt, SkullBlockEntity.loadProperties(new GameProfile(
+
-                    null,
+                SkullBlockEntity.loadProperties(new GameProfile(null, nbt.getString("playerName")), profile ->{ });
-                    nbt.getString("playerName")
-                )), source)).start();
             } else {
                 if (source.isClient()) {
-                    entity = EntityType.fromTag(nbt).map(type -> type.create(source.getWorld())).orElse(null);
+                    entity = EntityType.fromNbt(nbt).map(type -> type.create(source.getWorld())).orElse(null);
                     if (entity != null) {
                         try {
-                            entity.fromTag(nbt);
+                            entity.readNbt(nbt);
                         } catch (Exception ignored) {
                             // Mojang pls
                         }
@@ -161,8 +160,8 @@ public class Disguise implements NbtSerialisable {
         return entity;
     }
 
-    public void onImpact(Caster<?> pony, float distance, float damageMultiplier) {
+    public void onImpact(Caster<?> pony, float distance, float damageMultiplier, DamageSource cause) {
-        EntityBehaviour.forEntity(entity).onImpact(pony, entity, distance, damageMultiplier);
+        EntityBehaviour.forEntity(entity).onImpact(pony, entity, distance, damageMultiplier, cause);
     }
 
     private void onEntityLoaded(Caster<?> source) {
@@ -251,7 +250,7 @@ public class Disguise implements NbtSerialisable {
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         compound.putString("entityId", entityId);
 
         if (entityNbt != null) {
@@ -262,7 +261,7 @@ public class Disguise implements NbtSerialisable {
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         String newId = compound.getString("entityId");
 
         if (!newId.contentEquals(entityId)) {
@@ -279,7 +278,7 @@ public class Disguise implements NbtSerialisable {
 
             if (entity != null) {
                 try {
-                    entity.fromTag(entityNbt);
+                    entity.readNbt(entityNbt);
                 } catch (Exception ignored) {
                     // Mojang pls
                 }
@@ -296,8 +295,8 @@ public class Disguise implements NbtSerialisable {
             || entity instanceof FallingBlockEntity;
     }
 
-    private static CompoundTag encodeEntityToNBT(Entity entity) {
+    private static NbtCompound encodeEntityToNBT(Entity entity) {
-        CompoundTag entityNbt = new CompoundTag();
+        NbtCompound entityNbt = new NbtCompound();
 
         if (entity instanceof PlayerEntity) {
             GameProfile profile = ((PlayerEntity)entity).getGameProfile();
@@ -306,13 +305,13 @@ public class Disguise implements NbtSerialisable {
             entityNbt.putUuid("playerId", profile.getId());
             entityNbt.putString("playerName", profile.getName());
 
-            CompoundTag tag = new CompoundTag();
+            NbtCompound tag = new NbtCompound();
 
-            entity.saveToTag(tag);
+            entity.writeNbt(tag);
 
             entityNbt.put("playerNbt", tag);
         } else {
-            entity.saveToTag(entityNbt);
+            entity.writeNbt(entityNbt);
         }
 
         return entityNbt;

src/main/java/com/minelittlepony/unicopia/entity/behaviour/EntityBehaviour.java

@@ -3,21 +3,24 @@ package com.minelittlepony.unicopia.entity.behaviour;
 import java.util.Optional;
 import java.util.function.Supplier;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.ability.magic.Caster;
 import com.minelittlepony.unicopia.ability.magic.spell.DisguiseSpell;
 import com.minelittlepony.unicopia.entity.ItemWielder;
 import com.minelittlepony.unicopia.entity.player.Pony;
+import com.minelittlepony.unicopia.mixin.MixinEntity;
 import com.minelittlepony.unicopia.util.Registries;
 
 import net.minecraft.entity.Entity;
+import net.minecraft.entity.Entity.RemovalReason;
 import net.minecraft.entity.EntityDimensions;
 import net.minecraft.entity.EntityType;
 import net.minecraft.entity.EquipmentSlot;
 import net.minecraft.entity.FallingBlockEntity;
 import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.MovementType;
+import net.minecraft.entity.damage.DamageSource;
 import net.minecraft.entity.mob.AbstractSkeletonEntity;
 import net.minecraft.entity.passive.LlamaEntity;
 import net.minecraft.entity.passive.SnowGolemEntity;
@@ -47,7 +50,7 @@ public class EntityBehaviour<T extends Entity> {
 
     }
 
-    public void onImpact(Caster<?> source, T entity, float distance, float damageMultiplier) {
+    public void onImpact(Caster<?> source, T entity, float distance, float damageMultiplier, DamageSource cause) {
 
     }
 
@@ -59,7 +62,7 @@ public class EntityBehaviour<T extends Entity> {
     public void onDestroy(T entity) {
         entity.setInvulnerable(false);
         entity.setNoGravity(false);
-        entity.remove();
+        entity.remove(RemovalReason.KILLED);
     }
 
     public Optional<Double> getCameraDistance(Entity entity, Pony player) {
@@ -97,7 +100,7 @@ public class EntityBehaviour<T extends Entity> {
     public void copyBaseAttributes(LivingEntity from, Entity to, Vec3d positionOffset) {
         // Set first because position calculations rely on it
         to.age = from.age;
-        to.removed = from.removed;
+        ((MixinEntity)to).setRemovalReason(from.getRemovalReason());
         to.setOnGround(from.isOnGround());
 
         if (!from.world.isClient) {
@@ -143,10 +146,6 @@ public class EntityBehaviour<T extends Entity> {
             to.prevY = positionOffset.y + from.prevY;
             to.prevZ = positionOffset.z + from.prevZ;
 
-            to.chunkX = from.chunkX;
-            to.chunkY = from.chunkY;
-            to.chunkZ = from.chunkZ;
-
             to.lastRenderX = positionOffset.x + from.lastRenderX;
             to.lastRenderY = positionOffset.y + from.lastRenderY;
             to.lastRenderZ = positionOffset.z + from.lastRenderZ;
@@ -162,9 +161,9 @@ public class EntityBehaviour<T extends Entity> {
 
         to.setVelocity(from.getVelocity());
 
-        to.pitch = from.pitch;
+        to.setPitch(from.getPitch());
         to.prevPitch = from.prevPitch;
-        to.yaw = from.yaw;
+        to.setYaw(from.getYaw());
         to.prevYaw = from.prevYaw;
         to.horizontalSpeed = from.horizontalSpeed;
         to.prevHorizontalSpeed = from.prevHorizontalSpeed;
@@ -245,7 +244,7 @@ public class EntityBehaviour<T extends Entity> {
 
     protected boolean isSneakingOnGround(Caster<?> source) {
         Entity e = source.getEntity();
-        return e.isSneaking() && (e.isOnGround() || !(e instanceof PlayerEntity && ((PlayerEntity)e).abilities.flying));
+        return e.isSneaking() && (e.isOnGround() || !(e instanceof PlayerEntity && ((PlayerEntity)e).getAbilities().flying));
     }
 
     public static <T extends Entity> void register(Supplier<EntityBehaviour<T>> behaviour, EntityType<?>... types) {

src/main/java/com/minelittlepony/unicopia/entity/behaviour/FallingBlockBehaviour.java

@@ -8,6 +8,7 @@ import com.minelittlepony.unicopia.ability.magic.spell.DisguiseSpell;
 import com.minelittlepony.unicopia.entity.player.Pony;
 import com.minelittlepony.unicopia.mixin.MixinBlockEntity;
 import com.minelittlepony.unicopia.mixin.MixinFallingBlock;
+import com.minelittlepony.unicopia.util.Tickable;
 
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockEntityProvider;
@@ -21,9 +22,9 @@ import net.minecraft.block.enums.DoubleBlockHalf;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityDimensions;
 import net.minecraft.entity.FallingBlockEntity;
+import net.minecraft.entity.damage.DamageSource;
 import net.minecraft.state.property.Properties;
 import net.minecraft.tag.BlockTags;
-import net.minecraft.util.Tickable;
 import net.minecraft.util.math.Direction;
 import net.minecraft.util.math.Vec3d;
 
@@ -39,10 +40,10 @@ public class FallingBlockBehaviour extends EntityBehaviour<FallingBlockEntity> {
     }
 
     @Override
-    public void onImpact(Caster<?> source, FallingBlockEntity entity, float distance, float damageMultiplier) {
+    public void onImpact(Caster<?> source, FallingBlockEntity entity, float distance, float damageMultiplier, DamageSource cause) {
         if (source.getEntity().fallDistance > 3) {
             entity.fallDistance = source.getEntity().fallDistance;
-            entity.handleFallDamage(distance, damageMultiplier);
+            entity.handleFallDamage(distance, damageMultiplier, cause);
 
             BlockState state = entity.getBlockState();
             if (state.getBlock() instanceof FallingBlock) {
@@ -77,9 +78,7 @@ public class FallingBlockBehaviour extends EntityBehaviour<FallingBlockEntity> {
         }
 
         if (block instanceof BlockEntityProvider) {
-            BlockEntity b = ((BlockEntityProvider)block).createBlockEntity(entity.world);
+            context.addBlockEntity(((BlockEntityProvider)block).createBlockEntity(entity.getBlockPos(), state));
-            ((MixinBlockEntity)b).setCachedState(state);
-            context.addBlockEntity(b);
         }
 
         return configure(entity, block);
@@ -115,9 +114,10 @@ public class FallingBlockBehaviour extends EntityBehaviour<FallingBlockEntity> {
                 be.onSyncedBlockEvent(1, isSneakingOnGround(source) ? 1 : 0);
             }
 
-            be.setLocation(entity.world, entity.getBlockPos());
+            be.setWorld(entity.world);
+            ((MixinBlockEntity)be).setPos(entity.getBlockPos());
             ceb.tick();
-            be.setLocation(null, entity.getBlockPos());
+            be.setWorld(null);
         }
     }
 }

src/main/java/com/minelittlepony/unicopia/entity/behaviour/GhastBehaviour.java

@@ -28,9 +28,12 @@ public class GhastBehaviour extends MobBehaviour<GhastEntity> {
 
                 Vec3d rot = player.getEntity().getRotationVec(1);
 
-                FireballEntity proj = new FireballEntity(entity.world, entity, rot.getX(), rot.getY(), rot.getZ());
+                FireballEntity proj = new FireballEntity(entity.world, player.getMaster(),
-                proj.explosionPower = entity.getFireballStrength() * (player.getLevel().get() + 1);
+                        rot.getX(),
-                proj.setOwner(player.getMaster());
+                        rot.getY(),
+                        rot.getZ(),
+                        entity.getFireballStrength() * (player.getLevel().get() + 1)
+                );
                 proj.updatePosition(
                         entity.getX() + rot.x * 4,
                         entity.getBodyY(0.5D) + 0.5,

src/main/java/com/minelittlepony/unicopia/entity/behaviour/HoppingBehaviour.java

@@ -3,7 +3,6 @@ package com.minelittlepony.unicopia.entity.behaviour;
 import com.minelittlepony.unicopia.ability.magic.spell.DisguiseSpell;
 import com.minelittlepony.unicopia.entity.player.Pony;
 
-import net.minecraft.entity.Entity;
 import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.passive.RabbitEntity;
 
@@ -12,7 +11,7 @@ public class HoppingBehaviour extends EntityBehaviour<LivingEntity> {
     public void update(Pony player, LivingEntity entity, DisguiseSpell spell) {
 
         if (player.getEntity().isOnGround()) {
-            if (Entity.squaredHorizontalLength(player.getEntity().getVelocity()) > 0.01) {
+            if (player.getEntity().getVelocity().horizontalLengthSquared() > 0.01) {
                 player.getMaster().jump();
                 if (entity instanceof RabbitEntity) {
                     ((RabbitEntity)entity).startJump();

src/main/java/com/minelittlepony/unicopia/entity/behaviour/MinecartBehaviour.java

@@ -21,10 +21,10 @@ public class MinecartBehaviour extends EntityBehaviour<AbstractMinecartEntity> {
 
     @Override
     public void update(Caster<?> source, AbstractMinecartEntity entity, DisguiseSpell spell) {
-        entity.yaw -= 90;
+        entity.setYaw(entity.getYaw() - 90);
         entity.prevYaw -= 90;
 
-        entity.pitch = 0;
+        entity.setPitch(0);
         entity.prevPitch = 0;
 
         if (source.getEntity() instanceof LivingEntity) {

src/main/java/com/minelittlepony/unicopia/entity/behaviour/SheepBehaviour.java

@@ -44,13 +44,14 @@ public class SheepBehaviour extends EntityBehaviour<SheepEntity> {
                     entity.setSheared(true);
 
                     Random rng = entity.world.random;
-                    PlayerInventory inv = player.getMaster().inventory;
+                    PlayerInventory inv = player.getMaster().getInventory();
 
                     int dropAmount = rng.nextInt(3);
                     int slot;
 
                     do {
-                        slot = inv.method_7371(dropType);
+                        slot = inv.indexOf(dropType);
+
                         if (slot < 0) {
                             break;
                         }

src/main/java/com/minelittlepony/unicopia/entity/behaviour/ShulkerBehaviour.java

@@ -5,7 +5,6 @@ import com.minelittlepony.unicopia.ability.magic.spell.DisguiseSpell;
 import com.minelittlepony.unicopia.entity.player.Pony;
 import com.minelittlepony.unicopia.mixin.MixinShulkerEntity;
 
-import net.minecraft.entity.Entity;
 import net.minecraft.entity.mob.ShulkerEntity;
 import net.minecraft.sound.SoundEvents;
 import net.minecraft.util.math.BlockPos;
@@ -17,12 +16,10 @@ import net.minecraft.util.math.Vec3d;
 public class ShulkerBehaviour extends EntityBehaviour<ShulkerEntity> {
     @Override
     public void update(Caster<?> source, ShulkerEntity shulker, DisguiseSpell spell) {
-        shulker.yaw = 0;
+        shulker.setYaw(0);
         shulker.prevBodyYaw = 0;
         shulker.bodyYaw = 0;
 
-        shulker.setAttachedBlock(null);
-
         super.update(source, shulker, spell);
 
         Direction attachmentFace = shulker.getAttachedFace();
@@ -45,7 +42,7 @@ public class ShulkerBehaviour extends EntityBehaviour<ShulkerEntity> {
         float peekAmount = 30;
 
         double speed = !player.getEntity().isSneaking() ? 0.29 : 0;
-        speed += Math.sqrt(Entity.squaredHorizontalLength(player.getEntity().getVelocity())) * 2;
+        speed += Math.sqrt(player.getEntity().getVelocity().horizontalLengthSquared()) * 2;
 
         peekAmount = (float)MathHelper.clamp(speed, 0, 1);
         peekAmount = player.getInterpolator().interpolate("peek", peekAmount, 5);
@@ -56,8 +53,8 @@ public class ShulkerBehaviour extends EntityBehaviour<ShulkerEntity> {
         mx.setOpenProgress(peekAmount);
 
         if (player.sneakingChanged()) {
-            shulker.setPeekAmount((int)(peekAmount / 0.01F));
+            mx.callSetPeekAmount((int)(peekAmount / 0.01F));
-        } else if (peekAmount > 0.2 && shulker.getPeekAmount() == 0) {
+        } else if (peekAmount > 0.2 && mx.callGetPeekAmount() == 0) {
             if (shulker.isAlive() && shulker.world.random.nextInt(1000) < shulker.ambientSoundChance++) {
                 shulker.ambientSoundChance = -shulker.getMinAmbientSoundDelay();
                 shulker.playSound(SoundEvents.ENTITY_SHULKER_AMBIENT, 1, 1);

src/main/java/com/minelittlepony/unicopia/entity/behaviour/SpellcastingIllagerBehaviour.java

@@ -9,6 +9,14 @@ public class SpellcastingIllagerBehaviour extends EntityBehaviour<SpellcastingIl
     @Override
     public void update(Pony player, SpellcastingIllagerEntity entity, DisguiseSpell s) {
         if (player.sneakingChanged()) {
+            SpellCastAccess.setSpell(player, entity, s);
+        }
+    }
+
+    private static abstract class SpellCastAccess extends SpellcastingIllagerEntity {
+        SpellCastAccess() {super(null, null);}
+
+        static void setSpell(Pony player, SpellcastingIllagerEntity entity, DisguiseSpell s) {
             if (player.getMaster().isSneaking()) {
                 SpellcastingIllagerEntity.Spell[] spells = SpellcastingIllagerEntity.Spell.values();
                 SpellcastingIllagerEntity.Spell spell = spells[entity.world.random.nextInt(spells.length - 1) + 1];

src/main/java/com/minelittlepony/unicopia/entity/effect/RaceChangeStatusEffect.java

@@ -1,6 +1,6 @@
 package com.minelittlepony.unicopia.entity.effect;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.Race;
 import com.minelittlepony.unicopia.ability.magic.Caster;

src/main/java/com/minelittlepony/unicopia/entity/player/ManaContainer.java

@@ -1,7 +1,8 @@
 package com.minelittlepony.unicopia.entity.player;
 
+import com.minelittlepony.unicopia.util.Tickable;
+
 import net.minecraft.entity.data.TrackedData;
-import net.minecraft.util.Tickable;
 import net.minecraft.util.math.MathHelper;
 
 public class ManaContainer implements MagicReserves, Tickable {

src/main/java/com/minelittlepony/unicopia/entity/player/PlayerAttributes.java

@@ -5,6 +5,7 @@ import java.util.List;
 import java.util.UUID;
 
 import com.minelittlepony.unicopia.Race;
+import com.minelittlepony.unicopia.util.Tickable;
 
 import net.minecraft.entity.attribute.ClampedEntityAttribute;
 import net.minecraft.entity.attribute.EntityAttribute;
@@ -13,7 +14,6 @@ import net.minecraft.entity.attribute.EntityAttributeModifier;
 import net.minecraft.entity.attribute.EntityAttributeModifier.Operation;
 import net.minecraft.entity.attribute.EntityAttributes;
 import net.minecraft.entity.player.PlayerEntity;
-import net.minecraft.util.Tickable;
 import net.minecraft.util.registry.Registry;
 
 public class PlayerAttributes implements Tickable {

src/main/java/com/minelittlepony/unicopia/entity/player/PlayerDimensions.java

@@ -2,7 +2,7 @@ package com.minelittlepony.unicopia.entity.player;
 
 import java.util.Optional;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.Unicopia;
 

src/main/java/com/minelittlepony/unicopia/entity/player/PlayerPhysics.java

@@ -15,6 +15,7 @@ import com.minelittlepony.unicopia.item.enchantment.UEnchantments;
 import com.minelittlepony.unicopia.particle.ParticleUtils;
 import com.minelittlepony.unicopia.projectile.ProjectileUtil;
 import com.minelittlepony.unicopia.util.NbtSerialisable;
+import com.minelittlepony.unicopia.util.Tickable;
 import com.minelittlepony.unicopia.util.MutableVector;
 
 import net.minecraft.block.Block;
@@ -29,11 +30,10 @@ import net.minecraft.entity.attribute.EntityAttributeInstance;
 import net.minecraft.entity.damage.DamageSource;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.particle.ParticleTypes;
 import net.minecraft.sound.SoundCategory;
 import net.minecraft.sound.SoundEvents;
-import net.minecraft.util.Tickable;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.MathHelper;
 import net.minecraft.util.math.Vec3d;
@@ -121,7 +121,7 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
             entity.setPose(EntityPose.STANDING);
         }
 
-        boolean creative = entity.abilities.creativeMode || entity.isSpectator();
+        boolean creative = entity.getAbilities().creativeMode || entity.isSpectator();
 
         FlightType type = getFlightType();
 
@@ -131,12 +131,12 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
             entity.world.playSound(entity.getX(), entity.getY(), entity.getZ(), entity.world.getDimension().isUltrawarm() ? SoundEvents.BLOCK_BELL_USE : SoundEvents.BLOCK_BELL_RESONATE, SoundCategory.PLAYERS, 0.1125F, 1.5F, true);
         }
 
-        entity.abilities.allowFlying = type.canFlyCreative(entity);
+        entity.getAbilities().allowFlying = type.canFlyCreative(entity);
 
         if (!creative) {
-            entity.abilities.flying |= (type.canFly() || entity.abilities.allowFlying) && isFlyingEither;
+            entity.getAbilities().flying |= (type.canFly() || entity.getAbilities().allowFlying) && isFlyingEither;
             if (!type.canFly() && (type != lastFlightType)) {
-                entity.abilities.flying = false;
+                entity.getAbilities().flying = false;
             }
 
             if ((entity.isOnGround() && entity.isSneaking())
@@ -144,28 +144,28 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
                     || entity.horizontalCollision
                     || (entity.verticalCollision && (pony.getSpecies() != Race.BAT || velocity.y < 0))) {
 
-                if (entity.abilities.flying && entity.horizontalCollision) {
+                if (entity.getAbilities().flying && entity.horizontalCollision) {
                     handleWallCollission(entity, velocity);
 
                     entity.setVelocity(velocity.toImmutable());
-                    entity.abilities.flying = false;
+                    entity.getAbilities().flying = false;
                     return;
                 }
 
-                entity.abilities.flying = false;
+                entity.getAbilities().flying = false;
-                isFlyingSurvival = entity.abilities.flying && !creative;
+                isFlyingSurvival = entity.getAbilities().flying && !creative;
-                isFlyingEither = isFlyingSurvival || (creative && entity.abilities.flying);
+                isFlyingEither = isFlyingSurvival || (creative && entity.getAbilities().flying);
             }
         }
 
         lastFlightType = type;
 
-        isFlyingSurvival = entity.abilities.flying && !creative;
+        isFlyingSurvival = entity.getAbilities().flying && !creative;
-        isFlyingEither = isFlyingSurvival || (creative && entity.abilities.flying);
+        isFlyingEither = isFlyingSurvival || (creative && entity.getAbilities().flying);
 
         if (isGravityNegative()) {
             if (entity.isOnGround() || (!creative && entity.horizontalCollision)) {
-                entity.abilities.flying = false;
+                entity.getAbilities().flying = false;
                 isFlyingEither = false;
                 isFlyingSurvival = false;
             }
@@ -219,7 +219,7 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
 
                         if (!getFlightType().canFly()) {
                             entity.world.playSoundFromEntity(null, entity, SoundEvents.ITEM_SHIELD_BREAK, SoundCategory.PLAYERS, 1, 2);
-                            entity.abilities.flying = false;
+                            entity.getAbilities().flying = false;
                             isFlyingEither = false;
                             isFlyingSurvival = false;
                         }
@@ -288,7 +288,7 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
                     boolean fallingTakeOffCondition = !entity.isOnGround() && velocity.y < -1.6 * getGravitySignum();
 
                     if (takeOffCondition || fallingTakeOffCondition) {
-                        entity.abilities.flying = true;
+                        entity.getAbilities().flying = true;
                         isFlyingEither = true;
                         isFlyingSurvival = true;
 
@@ -364,9 +364,9 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
         // vertical drop due to gravity
         forward += 0.005F;
 
-        velocity.x += - forward * MathHelper.sin(player.yaw * 0.017453292F);
+        velocity.x += - forward * MathHelper.sin(player.getYaw() * 0.017453292F);
         velocity.y -= (0.01F / Math.max(motion * 100, 1)) * getGravityModifier();
-        velocity.z += forward * MathHelper.cos(player.yaw * 0.017453292F);
+        velocity.z += forward * MathHelper.cos(player.getYaw() * 0.017453292F);
     }
 
     protected void applyThrust(PlayerEntity player, MutableVector velocity) {
@@ -426,8 +426,8 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
         forward = Math.min(forward, 7);
         forward /= 1 + (EnchantmentHelper.getEquipmentLevel(UEnchantments.HEAVY, player) * 0.8F);
 
-        velocity.x += - forward * MathHelper.sin((player.yaw + glance) * 0.017453292F);
+        velocity.x += - forward * MathHelper.sin((player.getYaw() + glance) * 0.017453292F);
-        velocity.z += forward * MathHelper.cos((player.yaw + glance) * 0.017453292F);
+        velocity.z += forward * MathHelper.cos((player.getYaw() + glance) * 0.017453292F);
 
         if (!player.world.isClient && player.world.isThundering() && player.world.random.nextInt(9000) == 0) {
             LightningEntity lightning = EntityType.LIGHTNING_BOLT.create(player.world);
@@ -438,7 +438,7 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
     }
 
     protected double getHorizontalMotion(Entity e) {
-        return Entity.squaredHorizontalLength(e.getPos().subtract(lastPos));
+        return e.getPos().subtract(lastPos).horizontalLengthSquared();
     }
 
     private FlightType getFlightType() {
@@ -456,19 +456,19 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
     public void updateFlightStat(boolean flying) {
         FlightType type = getFlightType();
 
-        entity.abilities.allowFlying = type.canFlyCreative(entity);
+        entity.getAbilities().allowFlying = type.canFlyCreative(entity);
 
-        if (type.canFly() || entity.abilities.allowFlying) {
+        if (type.canFly() || entity.getAbilities().allowFlying) {
-            entity.abilities.flying |= flying;
+            entity.getAbilities().flying |= flying;
-            isFlyingSurvival = entity.abilities.flying;
+            isFlyingSurvival = entity.getAbilities().flying;
         } else {
-            entity.abilities.flying = false;
+            entity.getAbilities().flying = false;
             isFlyingSurvival = false;
         }
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         super.toNBT(compound);
         compound.putBoolean("isFlying", isFlyingSurvival);
         compound.putBoolean("isFlyingEither", isFlyingEither);
@@ -476,7 +476,7 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         super.fromNBT(compound);
         isFlyingSurvival = compound.getBoolean("isFlying");
         isFlyingEither = compound.getBoolean("isFlyingEither");

src/main/java/com/minelittlepony/unicopia/entity/player/Pony.java

@@ -5,7 +5,7 @@ import java.util.Objects;
 import java.util.Optional;
 import java.util.stream.Stream;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.Affinity;
 import com.minelittlepony.unicopia.client.UnicopiaClient;
@@ -28,6 +28,7 @@ import com.minelittlepony.unicopia.network.MsgRequestCapabilities;
 import com.minelittlepony.unicopia.network.Transmittable;
 import com.minelittlepony.unicopia.util.Copieable;
 import com.minelittlepony.unicopia.util.MagicalDamageSource;
+import com.minelittlepony.unicopia.util.Tickable;
 import com.minelittlepony.common.util.animation.LinearInterpolator;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Streams;
@@ -37,18 +38,18 @@ import com.mojang.authlib.GameProfile;
 import net.minecraft.block.BlockState;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.attribute.DefaultAttributeContainer;
+import net.minecraft.entity.damage.DamageSource;
 import net.minecraft.entity.data.DataTracker;
 import net.minecraft.entity.data.TrackedData;
 import net.minecraft.entity.data.TrackedDataHandlerRegistry;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.network.packet.s2c.play.EntityPassengersSetS2CPacket;
 import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.server.world.ServerWorld;
 import net.minecraft.text.Text;
 import net.minecraft.text.TranslatableText;
-import net.minecraft.util.Tickable;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.Direction;
 
@@ -61,7 +62,7 @@ public class Pony extends Living<PlayerEntity> implements Transmittable, Copieab
     static final TrackedData<Float> MANA = DataTracker.registerData(PlayerEntity.class, TrackedDataHandlerRegistry.FLOAT);
     static final TrackedData<Float> XP = DataTracker.registerData(PlayerEntity.class, TrackedDataHandlerRegistry.FLOAT);
 
-    private static final TrackedData<CompoundTag> EFFECT = DataTracker.registerData(PlayerEntity.class, TrackedDataHandlerRegistry.TAG_COMPOUND);
+    private static final TrackedData<NbtCompound> EFFECT = DataTracker.registerData(PlayerEntity.class, TrackedDataHandlerRegistry.TAG_COMPOUND);
 
     private final AbilityDispatcher powers = new AbilityDispatcher(this);
     private final PlayerPhysics gravity = new PlayerPhysics(this);
@@ -118,7 +119,7 @@ public class Pony extends Living<PlayerEntity> implements Transmittable, Copieab
 
         entity.getDataTracker().set(RACE, race.ordinal());
 
-        gravity.updateFlightStat(entity.abilities.flying);
+        gravity.updateFlightStat(entity.getAbilities().flying);
         entity.sendAbilitiesUpdate();
     }
 
@@ -262,7 +263,7 @@ public class Pony extends Living<PlayerEntity> implements Transmittable, Copieab
 
         if (isHanging()) {
             if (ticksHanging++ > 40) {
-                if (Entity.squaredHorizontalLength(entity.getVelocity()) > 0.01
+                if (entity.getVelocity().horizontalLengthSquared() > 0.01
                         || entity.isSneaking()
                         || !canHangAt(getHangingPos())) {
 
@@ -284,7 +285,7 @@ public class Pony extends Living<PlayerEntity> implements Transmittable, Copieab
         }
     }
 
-    public Optional<Float> onImpact(float distance, float damageMultiplier) {
+    public Optional<Float> onImpact(float distance, float damageMultiplier, DamageSource cause) {
 
         float g = gravity.getGravityModifier();
 
@@ -301,11 +302,11 @@ public class Pony extends Living<PlayerEntity> implements Transmittable, Copieab
 
             distance = Math.max(0, (distance * g) - 5);
 
-            handleFall(distance, damageMultiplier);
+            handleFall(distance, damageMultiplier, cause);
             return Optional.of(distance);
         }
 
-        handleFall(distance, damageMultiplier);
+        handleFall(distance, damageMultiplier, cause);
         return Optional.empty();
     }
 
@@ -349,7 +350,7 @@ public class Pony extends Living<PlayerEntity> implements Transmittable, Copieab
     protected Stream<ItemStack> getInventoryStacks() {
         return Streams.concat(
                 super.getInventoryStacks(),
-                entity.inventory.main.stream()
+                entity.getInventory().main.stream()
         );
     }
 
@@ -374,7 +375,7 @@ public class Pony extends Living<PlayerEntity> implements Transmittable, Copieab
     }
 
     @Override
-    public void toNBT(CompoundTag compound) {
+    public void toNBT(NbtCompound compound) {
         super.toNBT(compound);
         compound.putString("playerSpecies", getSpecies().name());
 
@@ -389,7 +390,7 @@ public class Pony extends Living<PlayerEntity> implements Transmittable, Copieab
     }
 
     @Override
-    public void fromNBT(CompoundTag compound) {
+    public void fromNBT(NbtCompound compound) {
         super.fromNBT(compound);
         speciesPersisted = true;
         setSpecies(Race.fromName(compound.getString("playerSpecies")));
@@ -407,7 +408,7 @@ public class Pony extends Living<PlayerEntity> implements Transmittable, Copieab
     @Override
     public void copyFrom(Pony oldPlayer) {
         speciesPersisted = oldPlayer.speciesPersisted;
-        if (!oldPlayer.getEntity().removed) {
+        if (!oldPlayer.getEntity().isRemoved()) {
             setSpell(oldPlayer.getSpellSlot().get(true).orElse(null));
         }
         oldPlayer.setSpell(null);

src/main/java/com/minelittlepony/unicopia/entity/player/dummy/DummyClientPlayerEntity.java

@@ -1,11 +1,12 @@
 package com.minelittlepony.unicopia.entity.player.dummy;
 
-import javax.annotation.Nonnull;
+import org.jetbrains.annotations.NotNull;
 
 import com.minelittlepony.unicopia.InteractionManager;
 import com.minelittlepony.unicopia.Owned;
 import com.mojang.authlib.GameProfile;
 
+import net.fabricmc.fabric.api.networking.v1.PacketByteBufs;
 import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.network.AbstractClientPlayerEntity;
 import net.minecraft.client.network.ClientPlayNetworkHandler;
@@ -38,7 +39,7 @@ public class DummyClientPlayerEntity extends AbstractClientPlayerEntity implemen
     }
 
     @Override
-    @Nonnull
+    @NotNull
     protected PlayerListEntry getPlayerListEntry() {
         if (playerInfo == null) {
             ClientPlayNetworkHandler connection = MinecraftClient.getInstance().getNetworkHandler();
@@ -74,11 +75,13 @@ public class DummyClientPlayerEntity extends AbstractClientPlayerEntity implemen
     }
 
     private final class Packet extends PlayerListS2CPacket {
+        public Packet() { super(PacketByteBufs.empty()); }
+
         PlayerListS2CPacket.Entry entry() {
             return new PlayerListS2CPacket.Entry(
                     getGameProfile(),
                     0,
-                    GameMode.NOT_SET,
+                    GameMode.DEFAULT,
                     new LiteralText(getGameProfile().getName()));
         }
     }

src/main/java/com/minelittlepony/unicopia/entity/player/dummy/DummyServerPlayerEntity.java

@@ -7,7 +7,6 @@ import com.mojang.authlib.GameProfile;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
 import net.minecraft.server.network.ServerPlayerEntity;
-import net.minecraft.server.network.ServerPlayerInteractionManager;
 import net.minecraft.server.world.ServerWorld;
 
 public class DummyServerPlayerEntity extends ServerPlayerEntity implements Owned<PlayerEntity> {
@@ -15,7 +14,7 @@ public class DummyServerPlayerEntity extends ServerPlayerEntity implements Owned
     private PlayerEntity owner;
 
     public DummyServerPlayerEntity(ServerWorld world, GameProfile profile) {
-        super(world.getServer(), world, profile, new ServerPlayerInteractionManager(world));
+        super(world.getServer(), world, profile);
     }
 
     @Override

src/main/java/com/minelittlepony/unicopia/item/AmuletItem.java

@@ -3,7 +3,7 @@ package com.minelittlepony.unicopia.item;
 import java.util.List;
 import java.util.Optional;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.google.common.collect.ImmutableMultimap;
 import com.google.common.collect.Multimap;

src/main/java/com/minelittlepony/unicopia/item/AppleItem.java

@@ -1,13 +1,14 @@
 package com.minelittlepony.unicopia.item;
 
 import java.util.List;
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.entity.IItemEntity;
 import com.minelittlepony.unicopia.entity.ItemImpl;
 import com.minelittlepony.unicopia.item.toxin.Toxicity;
 
 import net.minecraft.client.item.TooltipContext;
+import net.minecraft.entity.Entity.RemovalReason;
 import net.minecraft.entity.EntityType;
 import net.minecraft.entity.ItemEntity;
 import net.minecraft.item.Item;
@@ -29,10 +30,10 @@ public class AppleItem extends Item implements ItemImpl.TickableItem {
     public ActionResult onGroundTick(IItemEntity item) {
         ItemEntity entity = item.get().getMaster();
 
-        if (!entity.removed && item.getPickupDelay() == 0 && item.getAge() > 2030 && entity.world.random.nextInt(150) < 10) {
+        if (!entity.isRemoved() && item.getPickupDelay() == 0 && item.getAge() > 2030 && entity.world.random.nextInt(150) < 10) {
 
             if (!entity.world.isClient) {
-                entity.remove();
+                entity.remove(RemovalReason.KILLED);
 
                 ItemEntity neu = EntityType.ITEM.create(entity.world);
                 neu.copyPositionAndRotation(entity);
@@ -48,7 +49,7 @@ public class AppleItem extends Item implements ItemImpl.TickableItem {
                 entity.world.spawnEntity(copy);
             }
 
-            float bob = MathHelper.sin(((float)item.getAge() + 1) / 10F + entity.hoverHeight) * 0.1F + 0.1F;
+            float bob = MathHelper.sin(((float)item.getAge() + 1) / 10F + entity.uniqueOffset) * 0.1F + 0.1F;
 
             for (int i = 0; i < 3; i++) {
                 entity.world.addParticle(ParticleTypes.AMBIENT_ENTITY_EFFECT, entity.getX(), entity.getY() + bob, entity.getZ(),

src/main/java/com/minelittlepony/unicopia/item/CrystalHeartItem.java

@@ -101,7 +101,7 @@ public class CrystalHeartItem extends Item implements FloatingArtefactEntity.Art
                 List<LivingEntity> inputs = new ArrayList<>();
                 List<LivingEntity> outputs = new ArrayList<>();
 
-                VecHelper.findInRange(entity, entity.world, entity.getPos(), 20, EntityPredicates.EXCEPT_CREATIVE_OR_SPECTATOR.and(e -> !e.removed && (e instanceof PlayerEntity || e instanceof MobEntity))).forEach(e -> {
+                VecHelper.findInRange(entity, entity.world, entity.getPos(), 20, EntityPredicates.EXCEPT_CREATIVE_OR_SPECTATOR.and(e -> !e.isRemoved() && (e instanceof PlayerEntity || e instanceof MobEntity))).forEach(e -> {
                     LivingEntity living = (LivingEntity)e;
 
                     if (e instanceof PlayerEntity

src/main/java/com/minelittlepony/unicopia/item/DrinkableItem.java

@@ -23,7 +23,7 @@ public class DrinkableItem extends Item {
             serverPlayerEntity.incrementStat(Stats.USED.getOrCreateStat(this));
         }
 
-        if (user instanceof PlayerEntity && !((PlayerEntity)user).abilities.creativeMode) {
+        if (user instanceof PlayerEntity && !((PlayerEntity)user).getAbilities().creativeMode) {
             stack.decrement(1);
         }
 

src/main/java/com/minelittlepony/unicopia/item/FriendshipBraceletItem.java

@@ -2,7 +2,7 @@ package com.minelittlepony.unicopia.item;
 
 import java.util.List;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.EquinePredicates;
 import com.minelittlepony.unicopia.ability.magic.Caster;
@@ -42,7 +42,7 @@ public class FriendshipBraceletItem extends WearableItem implements DyeableItem,
             result.setCount(1);
             result.getOrCreateTag().putString("issuer", player.getName().asString());
 
-            if (!player.abilities.creativeMode) {
+            if (!player.getAbilities().creativeMode) {
                 stack.decrement(1);
             }
 

src/main/java/com/minelittlepony/unicopia/item/GemstoneItem.java

@@ -4,7 +4,7 @@ import java.util.List;
 import java.util.Objects;
 import java.util.function.Predicate;
 
-import javax.annotation.Nullable;
+import org.jetbrains.annotations.Nullable;
 
 import com.minelittlepony.unicopia.Affinity;
 import com.minelittlepony.unicopia.Unicopia;

src/main/java/com/minelittlepony/unicopia/item/GlowableItem.java

@@ -1,11 +1,11 @@
 package com.minelittlepony.unicopia.item;
 
 import net.minecraft.item.ItemStack;
-import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtCompound;
 
 public interface GlowableItem {
     default boolean isGlowing(ItemStack stack) {
-        CompoundTag tag = stack.getSubTag("display");
+        NbtCompound tag = stack.getSubTag("display");
         return tag != null && tag.getBoolean("glowing");
     }
 

src/main/java/com/minelittlepony/unicopia/item/JarItem.java

@@ -13,6 +13,7 @@ import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityType;
 import net.minecraft.entity.ItemEntity;
 import net.minecraft.entity.LightningEntity;
+import net.minecraft.entity.Entity.RemovalReason;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
@@ -47,20 +48,20 @@ public class JarItem extends Item implements ProjectileDelegate, ItemImpl.Tickab
         world.playSound(null, player.getX(), player.getY(), player.getZ(),
                 SoundEvents.ENTITY_SNOWBALL_THROW, SoundCategory.NEUTRAL,
                 0.5F,
-                0.4F / (RANDOM.nextFloat() * 0.4F + 0.8F));
+                0.4F / (world.random.nextFloat() * 0.4F + 0.8F));
 
         if (!world.isClient) {
             MagicProjectileEntity projectile = new MagicProjectileEntity(world, player);
             projectile.setItem(stack);
             projectile.setThrowDamage(getProjectileDamage(stack));
-            projectile.setProperties(player, player.pitch, player.yaw, 0, 1.5F, 1);
+            projectile.setProperties(player, player.getPitch(), player.getYaw(), 0, 1.5F, 1);
 
             world.spawnEntity(projectile);
         }
 
         player.incrementStat(Stats.USED.getOrCreateStat(this));
 
-        if (!player.abilities.creativeMode) {
+        if (!player.getAbilities().creativeMode) {
             stack.decrement(1);
         }
 
@@ -79,15 +80,15 @@ public class JarItem extends Item implements ProjectileDelegate, ItemImpl.Tickab
 
         if (!lightning
                 && !entity.world.isClient
-                && !entity.removed
+                && !entity.isRemoved()
-                && entity.getAge() > 100
+                && entity.getItemAge() > 100
                 && entity.world.isThundering()
                 && entity.world.isSkyVisible(entity.getBlockPos())
                 && entity.world.random.nextInt(130) == 0) {
             LightningEntity lightning = EntityType.LIGHTNING_BOLT.create(entity.world);
             lightning.refreshPositionAfterTeleport(entity.getX(), entity.getY(), entity.getZ());
 
-            entity.remove();
+            entity.remove(RemovalReason.DISCARDED);
             entity.world.spawnEntity(lightning);
 
             ItemEntity neu = EntityType.ITEM.create(entity.world);

src/main/java/com/minelittlepony/unicopia/item/ZapAppleItem.java

@@ -78,7 +78,7 @@ public class ZapAppleItem extends AppleItem implements ChameleonItem {
             e.onStruckByLightning((ServerWorld)e.world, lightning);
         }
 
-        if (!player.abilities.creativeMode) {
+        if (!player.getAbilities().creativeMode) {
             stack.decrement(1);
         }
 

src/main/java/com/minelittlepony/unicopia/item/enchantment/GemFindingEnchantment.java

@@ -10,7 +10,6 @@ import net.minecraft.client.MinecraftClient;
 import net.minecraft.enchantment.EnchantmentTarget;
 import net.minecraft.entity.EquipmentSlot;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.math.MathHelper;
 
 public class GemFindingEnchantment extends SimpleEnchantment {
 
@@ -24,14 +23,16 @@ public class GemFindingEnchantment extends SimpleEnchantment {
 
         BlockPos origin = user.getOrigin();
 
-        float volume = BlockPos.findClosest(origin, radius, radius, pos -> user.getWorld().getBlockState(pos).isIn(UTags.INTERESTING))
+
+
+        double volume = BlockPos.findClosest(origin, radius, radius, pos -> user.getWorld().getBlockState(pos).isIn(UTags.INTERESTING))
             .map(p -> user.getOriginVector().squaredDistanceTo(p.getX(), p.getY(), p.getZ()))
-            .map(find -> (1 - (MathHelper.sqrt(find) / radius)))
+            .map(find -> (1 - (Math.sqrt(find) / radius)))
-            .orElse(-1F);
+            .orElse(-1D);
 
         volume = Math.max(volume, 0.04F);
 
-        user.getEnchants().computeIfAbsent(this, Data::new).level = volume * (1.3F + level * 0.3F);
+        user.getEnchants().computeIfAbsent(this, Data::new).level = (float)volume * (1.3F + level * 0.3F);
     }
 
     @Environment(EnvType.CLIENT)