diff --git a/src/main/java/com/minelittlepony/unicopia/ability/magic/Levelled.java b/src/main/java/com/minelittlepony/unicopia/ability/magic/Levelled.java
index c3094400..2ea5d1e4 100644
--- a/src/main/java/com/minelittlepony/unicopia/ability/magic/Levelled.java
+++ b/src/main/java/com/minelittlepony/unicopia/ability/magic/Levelled.java
@@ -1,33 +1,32 @@
 package com.minelittlepony.unicopia.ability.magic;
 
+import java.util.function.IntConsumer;
 import java.util.function.IntSupplier;
 
 import net.minecraft.nbt.NbtCompound;
+import net.minecraft.util.math.MathHelper;
 
 /**
  * Object with levelling capabilities.
  */
 public interface Levelled {
-    LevelStore EMPTY = fixed(0);
+    LevelStore ZERO = of(0, 1);
 
-    static LevelStore fixed(int level) {
-        return of(() -> level);
-    }
-
-    static LevelStore of(IntSupplier supplier) {
+    static LevelStore of(IntSupplier getter, IntConsumer setter, IntSupplier max) {
         return new LevelStore() {
             @Override
             public int get() {
-                return supplier.getAsInt();
+                return getter.getAsInt();
             }
 
             @Override
             public void set(int level) {
+                setter.accept(level);
             }
 
             @Override
             public int getMax() {
-                return get();
+                return max.getAsInt();
             }
         };
     }
@@ -37,7 +36,9 @@ public interface Levelled {
     }
 
     static LevelStore fromNbt(NbtCompound compound) {
-        return of(compound.getInt("value"), compound.getInt("max"));
+        int max = Math.max(1, compound.getInt("max"));
+        int value = MathHelper.clamp(compound.getInt("value"), 0, max);
+        return of(value, max);
     }
 
     static LevelStore of(int level, int max) {
@@ -70,6 +71,9 @@ public interface Levelled {
         void set(int level);
 
         default float getScaled(float max) {
+            if (getMax() == 0) {
+                return max;
+            }
             return ((float)get() / getMax()) * max;
         }
 
diff --git a/src/main/java/com/minelittlepony/unicopia/entity/Creature.java b/src/main/java/com/minelittlepony/unicopia/entity/Creature.java
index bd0929c6..eb7e27b9 100644
--- a/src/main/java/com/minelittlepony/unicopia/entity/Creature.java
+++ b/src/main/java/com/minelittlepony/unicopia/entity/Creature.java
@@ -279,12 +279,12 @@ public class Creature extends Living<LivingEntity> implements WeaklyOwned.Mutabl
 
     @Override
     public LevelStore getLevel() {
-        return Levelled.EMPTY;
+        return Levelled.ZERO;
     }
 
     @Override
     public LevelStore getCorruption() {
-        return Levelled.EMPTY;
+        return Levelled.ZERO;
     }
 
     @Override
diff --git a/src/main/java/com/minelittlepony/unicopia/entity/EntityReference.java b/src/main/java/com/minelittlepony/unicopia/entity/EntityReference.java
index c401c1ce..49fa886e 100644
--- a/src/main/java/com/minelittlepony/unicopia/entity/EntityReference.java
+++ b/src/main/java/com/minelittlepony/unicopia/entity/EntityReference.java
@@ -134,8 +134,8 @@ public class EntityReference<T extends Entity> implements NbtSerialisable {
                 entity.getPos(),
                 entity.getId(), entity instanceof PlayerEntity,
                 !entity.isAlive(),
-                Caster.of(entity).map(Caster::getLevel).map(Levelled::copyOf).orElse(Levelled.EMPTY),
-                Caster.of(entity).map(Caster::getCorruption).map(Levelled::copyOf).orElse(Levelled.EMPTY)
+                Caster.of(entity).map(Caster::getLevel).map(Levelled::copyOf).orElse(Levelled.ZERO),
+                Caster.of(entity).map(Caster::getCorruption).map(Levelled::copyOf).orElse(Levelled.ZERO)
             );
         }
 
diff --git a/src/main/java/com/minelittlepony/unicopia/entity/mob/CastSpellEntity.java b/src/main/java/com/minelittlepony/unicopia/entity/mob/CastSpellEntity.java
index b5ec2dd4..9c7312df 100644
--- a/src/main/java/com/minelittlepony/unicopia/entity/mob/CastSpellEntity.java
+++ b/src/main/java/com/minelittlepony/unicopia/entity/mob/CastSpellEntity.java
@@ -17,11 +17,18 @@ import net.minecraft.entity.EntityDimensions;
 import net.minecraft.entity.EntityPose;
 import net.minecraft.entity.EntityType;
 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.NbtCompound;
 import net.minecraft.text.Text;
 import net.minecraft.world.World;
 
 public class CastSpellEntity extends LightEmittingEntity implements Caster<CastSpellEntity>, WeaklyOwned.Mutable<LivingEntity>, MagicImmune {
+    private static final TrackedData<Integer> LEVEL = DataTracker.registerData(CastSpellEntity.class, TrackedDataHandlerRegistry.INTEGER);
+    private static final TrackedData<Integer> MAX_LEVEL = DataTracker.registerData(CastSpellEntity.class, TrackedDataHandlerRegistry.INTEGER);
+    private static final TrackedData<Integer> CORRUPTION = DataTracker.registerData(CastSpellEntity.class, TrackedDataHandlerRegistry.INTEGER);
+    private static final TrackedData<Integer> MAX_CORRUPTION = DataTracker.registerData(CastSpellEntity.class, TrackedDataHandlerRegistry.INTEGER);
 
     private final EntityPhysics<CastSpellEntity> physics = new EntityPhysics<>(this);
 
@@ -29,8 +36,16 @@ public class CastSpellEntity extends LightEmittingEntity implements Caster<CastS
 
     private final EntityReference<LivingEntity> owner = new EntityReference<>();
 
-    private LevelStore level = Levelled.EMPTY;
-    private LevelStore corruption = Levelled.EMPTY;
+    private final LevelStore level = Levelled.of(
+            () -> dataTracker.get(LEVEL),
+            l -> dataTracker.set(LEVEL, l),
+            () -> dataTracker.get(MAX_LEVEL)
+    );
+    private final LevelStore corruption = Levelled.of(
+            () -> dataTracker.get(CORRUPTION),
+            l -> dataTracker.set(CORRUPTION, l),
+            () -> dataTracker.get(MAX_CORRUPTION)
+    );
 
     public CastSpellEntity(EntityType<?> type, World world) {
         super(type, world);
@@ -39,6 +54,10 @@ public class CastSpellEntity extends LightEmittingEntity implements Caster<CastS
 
     @Override
     protected void initDataTracker() {
+        dataTracker.startTracking(LEVEL, 0);
+        dataTracker.startTracking(CORRUPTION, 0);
+        dataTracker.startTracking(MAX_LEVEL, 1);
+        dataTracker.startTracking(MAX_CORRUPTION, 1);
     }
 
     @Override
@@ -84,8 +103,10 @@ public class CastSpellEntity extends LightEmittingEntity implements Caster<CastS
     }
 
     public void setCaster(Caster<?> caster) {
-        this.level = Levelled.copyOf(caster.getLevel());
-        this.corruption = Levelled.copyOf(caster.getCorruption());
+        dataTracker.set(LEVEL, caster.getLevel().get());
+        dataTracker.set(MAX_LEVEL, caster.getLevel().getMax());
+        dataTracker.set(CORRUPTION, caster.getCorruption().get());
+        dataTracker.set(MAX_CORRUPTION, caster.getCorruption().getMax());
         setMaster(caster);
     }
 
@@ -144,7 +165,11 @@ public class CastSpellEntity extends LightEmittingEntity implements Caster<CastS
             owner.fromNBT(tag.getCompound("owner"));
         }
         spells.getSlots().fromNBT(tag);
-        level = Levelled.fromNbt(tag.getCompound("level"));
-        corruption = Levelled.fromNbt(tag.getCompound("corruption"));
+        var level = Levelled.fromNbt(tag.getCompound("level"));
+        dataTracker.set(MAX_LEVEL, level.getMax());
+        dataTracker.set(LEVEL, level.get());
+        var corruption = Levelled.fromNbt(tag.getCompound("corruption"));
+        dataTracker.set(MAX_CORRUPTION, corruption.getMax());
+        dataTracker.set(CORRUPTION, corruption.get());
     }
 }
diff --git a/src/main/java/com/minelittlepony/unicopia/projectile/MagicBeamEntity.java b/src/main/java/com/minelittlepony/unicopia/projectile/MagicBeamEntity.java
index fa3c7d82..122bef3e 100644
--- a/src/main/java/com/minelittlepony/unicopia/projectile/MagicBeamEntity.java
+++ b/src/main/java/com/minelittlepony/unicopia/projectile/MagicBeamEntity.java
@@ -4,6 +4,8 @@ import java.util.Optional;
 import java.util.function.Consumer;
 import java.util.function.Function;
 
+import org.jetbrains.annotations.Nullable;
+
 import com.minelittlepony.unicopia.Affinity;
 import com.minelittlepony.unicopia.InteractionManager;
 import com.minelittlepony.unicopia.ability.magic.Affine;
@@ -31,10 +33,25 @@ import net.minecraft.world.World;
 
 public class MagicBeamEntity extends MagicProjectileEntity implements Caster<MagicBeamEntity>, MagicImmune {
     private static final TrackedData<Boolean> HYDROPHOBIC = DataTracker.registerData(MagicBeamEntity.class, TrackedDataHandlerRegistry.BOOLEAN);
+    private static final TrackedData<Integer> LEVEL = DataTracker.registerData(MagicBeamEntity.class, TrackedDataHandlerRegistry.INTEGER);
+    private static final TrackedData<Integer> MAX_LEVEL = DataTracker.registerData(MagicBeamEntity.class, TrackedDataHandlerRegistry.INTEGER);
+    private static final TrackedData<Integer> CORRUPTION = DataTracker.registerData(MagicBeamEntity.class, TrackedDataHandlerRegistry.INTEGER);
+    private static final TrackedData<Integer> MAX_CORRUPTION = DataTracker.registerData(MagicBeamEntity.class, TrackedDataHandlerRegistry.INTEGER);
 
     private final SpellInventory spells = SpellSlots.ofSingle(this);
     private final EntityPhysics<MagicProjectileEntity> physics = new EntityPhysics<>(this);
 
+    private final LevelStore level = Levelled.of(
+            () -> dataTracker.get(LEVEL),
+            l -> dataTracker.set(LEVEL, l),
+            () -> dataTracker.get(MAX_LEVEL)
+    );
+    private final LevelStore corruption = Levelled.of(
+            () -> dataTracker.get(CORRUPTION),
+            l -> dataTracker.set(CORRUPTION, l),
+            () -> dataTracker.get(MAX_CORRUPTION)
+    );
+
     public MagicBeamEntity(EntityType<MagicBeamEntity> type, World world) {
         super(type, world);
     }
@@ -51,7 +68,11 @@ public class MagicBeamEntity extends MagicProjectileEntity implements Caster<Mag
     @Override
     protected void initDataTracker() {
         super.initDataTracker();
-        getDataTracker().startTracking(HYDROPHOBIC, false);
+        dataTracker.startTracking(HYDROPHOBIC, false);
+        dataTracker.startTracking(LEVEL, 0);
+        dataTracker.startTracking(CORRUPTION, 0);
+        dataTracker.startTracking(MAX_LEVEL, 1);
+        dataTracker.startTracking(MAX_CORRUPTION, 1);
     }
 
     @Override
@@ -92,14 +113,25 @@ public class MagicBeamEntity extends MagicProjectileEntity implements Caster<Mag
         return this;
     }
 
+    @Override
+    public void setOwner(@Nullable Entity entity) {
+        super.setOwner(entity);
+        Caster.of(entity).ifPresent(caster -> {
+            dataTracker.set(LEVEL, caster.getLevel().get());
+            dataTracker.set(MAX_LEVEL, caster.getLevel().getMax());
+            dataTracker.set(CORRUPTION, caster.getCorruption().get());
+            dataTracker.set(MAX_CORRUPTION, caster.getCorruption().getMax());
+        });
+    }
+
     @Override
     public LevelStore getLevel() {
-        return getMasterReference().getTarget().map(target -> target.level()).orElse(Levelled.EMPTY);
+        return level;
     }
 
     @Override
     public LevelStore getCorruption() {
-        return getMasterReference().getTarget().map(target -> target.corruption()).orElse(Levelled.EMPTY);
+        return corruption;
     }
 
     @Override
@@ -149,11 +181,19 @@ public class MagicBeamEntity extends MagicProjectileEntity implements Caster<Mag
         getDataTracker().set(HYDROPHOBIC, compound.getBoolean("hydrophobic"));
         physics.fromNBT(compound);
         spells.getSlots().fromNBT(compound);
+        var level = Levelled.fromNbt(compound.getCompound("level"));
+        dataTracker.set(MAX_LEVEL, level.getMax());
+        dataTracker.set(LEVEL, level.get());
+        var corruption = Levelled.fromNbt(compound.getCompound("corruption"));
+        dataTracker.set(MAX_CORRUPTION, corruption.getMax());
+        dataTracker.set(CORRUPTION, corruption.get());
     }
 
     @Override
     public void writeCustomDataToNbt(NbtCompound compound) {
         super.writeCustomDataToNbt(compound);
+        compound.put("level", level.toNbt());
+        compound.put("corruption", corruption.toNbt());
         compound.putBoolean("hydrophobic", getHydrophobic());
         physics.toNBT(compound);
         spells.getSlots().toNBT(compound);
diff --git a/src/main/java/com/minelittlepony/unicopia/projectile/MagicProjectileEntity.java b/src/main/java/com/minelittlepony/unicopia/projectile/MagicProjectileEntity.java
index 3b8064ae..8591048d 100644
--- a/src/main/java/com/minelittlepony/unicopia/projectile/MagicProjectileEntity.java
+++ b/src/main/java/com/minelittlepony/unicopia/projectile/MagicProjectileEntity.java
@@ -78,7 +78,7 @@ public class MagicProjectileEntity extends ThrownItemEntity implements WeaklyOwn
     }
 
     @Override
-    public void setMaster(LivingEntity owner) {
+    public final void setMaster(LivingEntity owner) {
         setOwner(owner);
     }
 
@@ -86,13 +86,13 @@ public class MagicProjectileEntity extends ThrownItemEntity implements WeaklyOwn
     public void setOwner(@Nullable Entity entity) {
         super.setOwner(entity);
         if (entity instanceof LivingEntity l) {
-            getMasterReference().set(l);
+            WeaklyOwned.Mutable.super.setMaster(l);
         }
     }
 
     @Override
     @Nullable
-    public Entity getOwner() {
+    public final Entity getOwner() {
         return getMaster();
     }