Players wearing the alicorn amulet will have a corrupting influence on entities that are around them

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

@@ -8,7 +8,7 @@ import com.minelittlepony.unicopia.InteractionManager;
 import com.minelittlepony.unicopia.USounds;
 import com.minelittlepony.unicopia.client.sound.LoopingSoundInstance;
 import com.minelittlepony.unicopia.client.sound.MotionBasedSoundInstance;
-import com.minelittlepony.unicopia.entity.effect.SunBlindnessStatusEffect;
+import com.minelittlepony.unicopia.entity.effect.UEffects;
 import com.minelittlepony.unicopia.entity.player.PlayerPhysics;
 import com.minelittlepony.unicopia.entity.player.Pony;
 import com.minelittlepony.unicopia.entity.player.dummy.DummyClientPlayerEntity;
@@ -53,7 +53,7 @@ public class ClientInteractionManager extends InteractionManager {
             SoundManager soundManager = client.getSoundManager();
 
             if (type == SOUND_EARS_RINGING && source instanceof LivingEntity) {
-                soundManager.play(new LoopingSoundInstance<>((LivingEntity)source, e -> e.hasStatusEffect(SunBlindnessStatusEffect.INSTANCE), USounds.ENTITY_PLAYER_EARS_RINGING, 1F, 1F));
+                soundManager.play(new LoopingSoundInstance<>((LivingEntity)source, e -> e.hasStatusEffect(UEffects.SUN_BLINDNESS), USounds.ENTITY_PLAYER_EARS_RINGING, 1F, 1F));
             } else if (type == SOUND_BEE && source instanceof BeeEntity) {
                 soundManager.playNextTick(
                         ((BeeEntity)source).hasAngerTime()

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

@@ -13,6 +13,7 @@ import com.minelittlepony.unicopia.ability.magic.spell.SpellType;
 import com.minelittlepony.unicopia.client.KeyBindingsHandler;
 import com.minelittlepony.unicopia.entity.behaviour.Disguise;
 import com.minelittlepony.unicopia.entity.effect.SunBlindnessStatusEffect;
+import com.minelittlepony.unicopia.entity.effect.UEffects;
 import com.minelittlepony.unicopia.entity.player.Pony;
 import com.mojang.blaze3d.systems.RenderSystem;
 
@@ -151,10 +152,10 @@ public class UHud extends DrawableHelper {
 
     protected void renderViewEffects(Pony pony, MatrixStack matrices, int scaledWidth, int scaledHeight, float tickDelta) {
 
-        boolean hasEffect = client.player.hasStatusEffect(SunBlindnessStatusEffect.INSTANCE);
+        boolean hasEffect = client.player.hasStatusEffect(UEffects.SUN_BLINDNESS);
 
         if (hasEffect || (pony.getSpecies() == Race.BAT && SunBlindnessStatusEffect.hasSunExposure(client.player))) {
-            float i = hasEffect ? (client.player.getStatusEffect(SunBlindnessStatusEffect.INSTANCE).getDuration() - tickDelta) / SunBlindnessStatusEffect.MAX_DURATION : 0;
+            float i = hasEffect ? (client.player.getStatusEffect(UEffects.SUN_BLINDNESS).getDuration() - tickDelta) / SunBlindnessStatusEffect.MAX_DURATION : 0;
 
             float pulse = (1 + (float)Math.sin(client.player.age / 108F)) * 0.25F;
 

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

@@ -0,0 +1,84 @@
+package com.minelittlepony.unicopia.entity.effect;
+
+import org.jetbrains.annotations.Nullable;
+
+import com.minelittlepony.unicopia.Owned;
+import com.minelittlepony.unicopia.entity.Equine;
+import com.minelittlepony.unicopia.util.MagicalDamageSource;
+
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.LivingEntity;
+import net.minecraft.entity.attribute.EntityAttributeModifier;
+import net.minecraft.entity.attribute.EntityAttributes;
+import net.minecraft.entity.effect.StatusEffect;
+import net.minecraft.entity.effect.StatusEffectType;
+import net.minecraft.entity.mob.HostileEntity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.world.WorldEvents;
+
+public class CorruptInfluenceStatusEffect extends StatusEffect {
+    CorruptInfluenceStatusEffect(int color) {
+        super(StatusEffectType.NEUTRAL, color);
+        addAttributeModifier(EntityAttributes.GENERIC_ATTACK_DAMAGE, "6D706448-6A60-4F59-BE8A-C23A6DD2C7A9", 120, EntityAttributeModifier.Operation.ADDITION);
+        addAttributeModifier(EntityAttributes.GENERIC_ATTACK_SPEED, "6D706448-6A60-4F59-BE8A-C23A6DD2C7A9", 10, EntityAttributeModifier.Operation.ADDITION);
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public void applyUpdateEffect(LivingEntity entity, int amplifier) {
+
+        if (entity.world.isClient) {
+            return;
+        }
+
+        if (entity instanceof HostileEntity) {
+
+            int nearby = 0;
+
+            for (Entity i : entity.world.getOtherEntities(entity, entity.getBoundingBox().expand(40))) {
+                if (i.getType() == entity.getType()) {
+                    nearby++;
+                }
+            }
+
+            if (nearby > 1) {
+                if (Equine.of(entity).filter(eq -> eq instanceof Owned && ((Owned<?>)eq).getMaster() != null).isPresent()) {
+                    return;
+                }
+
+                if (entity.world.random.nextInt(2000) != 0) {
+                    return;
+                }
+            } else if (entity.world.random.nextInt(200) != 0) {
+                return;
+            }
+
+            HostileEntity mob = (HostileEntity)entity;
+
+            HostileEntity clone = (HostileEntity)mob.getType().create(mob.world);
+            clone.copyPositionAndRotation(entity);
+
+            Equine.of(clone).ifPresent(eq -> {
+                ((Owned<Entity>)eq).setMaster(mob);
+            });
+            mob.world.spawnEntity(clone);
+
+            if (!mob.isSilent()) {
+                mob.world.syncWorldEvent((PlayerEntity)null, WorldEvents.ZOMBIE_INFECTS_VILLAGER, mob.getBlockPos(), 0);
+            }
+        } else if (entity.age % 20 == 0) {
+            entity.damage(MagicalDamageSource.ALICORN_AMULET, 2);
+        }
+
+    }
+
+    @Override
+    public void applyInstantEffect(@Nullable Entity source, @Nullable Entity attacker, LivingEntity target, int amplifier, double proximity) {
+        applyUpdateEffect(target, amplifier);
+    }
+
+    @Override
+    public boolean canApplyUpdateEffect(int duration, int amplifier) {
+        return duration > 0;
+    }
+}

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

@@ -0,0 +1,50 @@
+package com.minelittlepony.unicopia.entity.effect;
+
+import org.jetbrains.annotations.Nullable;
+
+import com.minelittlepony.unicopia.util.MagicalDamageSource;
+
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.LivingEntity;
+import net.minecraft.entity.effect.StatusEffect;
+import net.minecraft.entity.effect.StatusEffectInstance;
+import net.minecraft.entity.effect.StatusEffectType;
+import net.minecraft.entity.effect.StatusEffects;
+
+public class FoodPoisoningStatusEffect extends StatusEffect {
+
+    FoodPoisoningStatusEffect(int color) {
+        super(StatusEffectType.HARMFUL, color);
+    }
+
+    @Override
+    public void applyUpdateEffect(LivingEntity entity, int amplifier) {
+
+        StatusEffectInstance nausea = entity.getStatusEffect(StatusEffects.NAUSEA);
+        if (nausea == null) {
+            StatusEffectInstance foodEffect = entity.getStatusEffect(this);
+            nausea = new StatusEffectInstance(StatusEffects.NAUSEA, foodEffect.getDuration(),
+                    foodEffect.getAmplifier(),
+                    true,
+                    foodEffect.shouldShowParticles(),
+                    false
+            );
+
+            entity.addStatusEffect(nausea);
+        }
+
+        entity.damage(MagicalDamageSource.FOOD_POISONING, amplifier);
+
+    }
+
+    @Override
+    public void applyInstantEffect(@Nullable Entity source, @Nullable Entity attacker, LivingEntity target, int amplifier, double proximity) {
+        applyUpdateEffect(target, amplifier);
+    }
+
+    @Override
+    public boolean canApplyUpdateEffect(int duration, int amplifier) {
+        int i = 40 >> amplifier;
+        return i <= 0 || duration % i == 0;
+    }
+}

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

@@ -13,19 +13,13 @@ import net.minecraft.entity.effect.StatusEffect;
 import net.minecraft.entity.effect.StatusEffectInstance;
 import net.minecraft.entity.effect.StatusEffectType;
 import net.minecraft.entity.effect.StatusEffects;
-import net.minecraft.util.Identifier;
-import net.minecraft.util.registry.Registry;
 import net.minecraft.world.LightType;
 
 public class SunBlindnessStatusEffect extends StatusEffect {
     public static final int MAX_DURATION = 50;
 
-    public static final SunBlindnessStatusEffect INSTANCE = new SunBlindnessStatusEffect(0x886F0F);
+    SunBlindnessStatusEffect(int color) {
-
-    private SunBlindnessStatusEffect(int color) {
         super(StatusEffectType.NEUTRAL, color);
-
-        Registry.register(Registry.STATUS_EFFECT, new Identifier("unicopia", "sun_blindness"), this);
     }
 
     @Override

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

@@ -1,29 +1,17 @@
 package com.minelittlepony.unicopia.entity.effect;
 
-import com.minelittlepony.unicopia.util.MagicalDamageSource;
-
 import net.minecraft.entity.effect.StatusEffect;
-import net.minecraft.entity.effect.StatusEffectInstance;
-import net.minecraft.entity.effect.StatusEffectType;
-import net.minecraft.entity.effect.StatusEffects;
 import net.minecraft.util.Identifier;
+import net.minecraft.util.registry.Registry;
 
 public interface UEffects {
+    StatusEffect FOOD_POISONING = register("food_poisoning", new FoodPoisoningStatusEffect(3484199));
+    StatusEffect SUN_BLINDNESS = register("sun_blindness", new SunBlindnessStatusEffect(0x886F0F));
+    StatusEffect CORRUPT_INFLUENCE = register("corrupt_influence", new CorruptInfluenceStatusEffect(0x00FF00));
 
-    StatusEffect FOOD_POISONING = new CustomStatusEffect.Builder(new Identifier("unicopia", "food_poisoning"), StatusEffectType.HARMFUL, 3484199).direct((p, e, i) -> {
+    private static StatusEffect register(String name, StatusEffect effect) {
-        StatusEffectInstance nausea = e.getStatusEffect(StatusEffects.NAUSEA);
+        return Registry.register(Registry.STATUS_EFFECT, new Identifier("unicopia", name), effect);
-        if (nausea == null) {
+    }
-            StatusEffectInstance foodEffect = e.getStatusEffect(p);
-            nausea = new StatusEffectInstance(StatusEffects.NAUSEA, foodEffect.getDuration(),
-                    foodEffect.getAmplifier(),
-                    true,
-                    foodEffect.shouldShowParticles(),
-                    false
-            );
 
-            e.addStatusEffect(nausea);
+    static void bootstrap() {}
-        }
-
-        e.damage(MagicalDamageSource.FOOD_POISONING, i);
-    }).build();
 }

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

@@ -1,6 +1,5 @@
 package com.minelittlepony.unicopia.entity.effect;
 
-import net.minecraft.entity.effect.StatusEffect;
 import net.minecraft.entity.effect.StatusEffectInstance;
 import net.minecraft.potion.Potion;
 import net.minecraft.util.Identifier;
@@ -24,7 +23,6 @@ public interface UPotions {
     }
 
     static void bootstrap() {
-        @SuppressWarnings("unused")
+        UEffects.bootstrap();
-        StatusEffect e = SunBlindnessStatusEffect.INSTANCE;
     }
 }

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

@@ -22,6 +22,7 @@ import com.minelittlepony.unicopia.entity.PonyContainer;
 import com.minelittlepony.unicopia.entity.Living;
 import com.minelittlepony.unicopia.entity.Trap;
 import com.minelittlepony.unicopia.entity.effect.SunBlindnessStatusEffect;
+import com.minelittlepony.unicopia.entity.effect.UEffects;
 import com.minelittlepony.unicopia.item.UItems;
 import com.minelittlepony.unicopia.item.toxin.Toxin;
 import com.minelittlepony.unicopia.network.Channel;
@@ -298,7 +299,7 @@ public class Pony extends Living<PlayerEntity> implements Transmittable, Copieab
                 }
 
                 if (ticksInSun == 1) {
-                    entity.addStatusEffect(new StatusEffectInstance(SunBlindnessStatusEffect.INSTANCE, SunBlindnessStatusEffect.MAX_DURATION * 10, 1, true, false));
+                    entity.addStatusEffect(new StatusEffectInstance(UEffects.SUN_BLINDNESS, SunBlindnessStatusEffect.MAX_DURATION * 10, 1, true, false));
                     UCriteria.LOOK_INTO_SUN.trigger(entity);
 
                     if (isClient() && isClientPlayer()) {

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

@@ -11,6 +11,7 @@ import com.minelittlepony.unicopia.AwaitTickQueue;
 import com.minelittlepony.unicopia.entity.IItemEntity;
 import com.minelittlepony.unicopia.entity.ItemImpl;
 import com.minelittlepony.unicopia.entity.ItemImpl.TickableItem;
+import com.minelittlepony.unicopia.entity.effect.UEffects;
 import com.minelittlepony.unicopia.entity.player.MagicReserves;
 import com.minelittlepony.unicopia.entity.player.PlayerCharmTracker;
 import com.minelittlepony.unicopia.entity.player.Pony;
@@ -28,6 +29,7 @@ import net.minecraft.entity.ItemEntity;
 import net.minecraft.entity.attribute.EntityAttributes;
 import net.minecraft.entity.effect.StatusEffectInstance;
 import net.minecraft.entity.effect.StatusEffects;
+import net.minecraft.entity.mob.MobEntity;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.item.ItemStack;
 import net.minecraft.particle.ParticleEffect;
@@ -200,6 +202,10 @@ public class AlicornAmuletItem extends AmuletItem implements PlayerCharmTracker.
                 w.createExplosion(player, pos.x, pos.y, pos.z, 6, DestructionType.BREAK);
             }, 50);
         }
+
+        pony.findAllEntitiesInRange(10, e -> e instanceof MobEntity && !((MobEntity)e).hasStatusEffect(UEffects.CORRUPT_INFLUENCE)).forEach(e -> {
+            ((MobEntity)e).addStatusEffect(new StatusEffectInstance(UEffects.CORRUPT_INFLUENCE, 1300, 1));
+        });
     }
 
     @Override