PaperMC · Warriorrrr · Jan 3, 2026 · Jan 4, 2026 · Jan 4, 2026 · Jan 4, 2026
@@ -1,5 +1,6 @@
 package org.bukkit.entity;
 
+import net.kyori.adventure.util.TriState;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
 
@@ -33,14 +34,15 @@ public interface AbstractSkeleton extends Monster, com.destroystokyo.paper.entit
     @Contract("_ -> fail")
     public void setSkeletonType(Skeleton.SkeletonType type);
 
-    // Paper start
     /**
      * Check if this skeleton will burn in the sunlight. This
      * does not take into account an entity's natural fire
      * immunity.
      *
      * @return True if skeleton will burn in sunlight
+     * @deprecated All mobs can now be changed to burn in daylight, use {@link Mob#burnsInDaylight()} instead.
      */
+    @Deprecated(since = "1.21.11")
     boolean shouldBurnInDay();
 
     /**
@@ -49,7 +51,8 @@ public interface AbstractSkeleton extends Monster, com.destroystokyo.paper.entit
      * immunity.
      *
      * @param shouldBurnInDay True to burn in sunlight
+     * @deprecated All mobs can now be changed to burn in daylight, use {@link Mob#setBurnInDaylightOverride(TriState)} instead.
      */
+    @Deprecated(since = "1.21.11")
     void setShouldBurnInDay(boolean shouldBurnInDay);
-    // Paper end
 }
@@ -257,4 +257,24 @@ default void setLootTable(final @Nullable LootTable table, final long seed) {
      * @return the amount of experience the mob will possibly drop
      */
     int getPossibleExperienceReward();
+
+    /**
+     * {@return whether this mob will burn when exposed to daylight, accounting for environment attributes, but not for fire immunity or sun protection items}
+     * @see #isInDaylight()
+     */
+    boolean burnsInDaylight();
+
+    /**
+     * Sets whether this mob will burn in daylight, a value of {@link TriState#NOT_SET} makes default behavior apply.
+     *
+     * @param state a {@link TriState} representing the state of the override
+     */
+    void setBurnInDaylightOverride(TriState state);
+
+    /**
+     * Gets whether this mob will burn in daylight, a value of {@link TriState#NOT_SET} means default behavior apply.
+     *
+     * @return a {@link TriState} representing the state of the override
+     */
+    TriState getBurnInDaylightOverride();
 }
@@ -1,5 +1,6 @@
 package org.bukkit.entity;
 
+import net.kyori.adventure.util.TriState;
 import org.bukkit.Location;
 import org.jetbrains.annotations.Nullable;
 import java.util.UUID;
@@ -31,15 +32,19 @@ public interface Phantom extends Flying, Enemy {
      * Check if this phantom will burn in the sunlight
      *
      * @return True if phantom will burn in sunlight
+     * @deprecated All mobs can now be changed to burn in daylight, use {@link Mob#burnsInDaylight()} instead.
      */
-    public boolean shouldBurnInDay();
+    @Deprecated(since = "1.21.11")
+    boolean shouldBurnInDay();
 
     /**
      * Set if this phantom should burn in the sunlight
      *
      * @param shouldBurnInDay True to burn in sunlight
+     * @deprecated All mobs can now be changed to burn in daylight, use {@link Mob#setBurnInDaylightOverride(TriState)} instead.
      */
-    public void setShouldBurnInDay(boolean shouldBurnInDay);
+    @Deprecated(since = "1.21.11")
+    void setShouldBurnInDay(boolean shouldBurnInDay);
 
     /**
      * Gets the location that this phantom circles around when not attacking a player

@@ -1,5 +1,6 @@
 package org.bukkit.entity;
 
+import net.kyori.adventure.util.TriState;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.Nullable;
 
@@ -153,14 +154,18 @@ public interface Zombie extends Monster, Ageable {
      * Check if this zombie will burn in the sunlight
      *
      * @return True if zombie will burn in sunlight
+     * @deprecated All mobs can now be changed to burn in daylight, use {@link Mob#burnsInDaylight()} instead.
      */
+    @Deprecated(since = "1.21.11")
     boolean shouldBurnInDay();
 
     /**
      * Set if this zombie should burn in the sunlight
      *
      * @param shouldBurnInDay True to burn in sunlight
+     * @deprecated All mobs can now be changed to burn in daylight, use {@link Mob#setBurnInDaylightOverride(TriState)} instead.
      */
+    @Deprecated(since = "1.21.11")
     void setShouldBurnInDay(boolean shouldBurnInDay);
 
     /**

@@ -464,7 +464,7 @@ index 5461bd9a39bb20ad29d3bc110c38860cf35a770a..75f80787966cdda6f51f55a8f6cb2218
      public void tick() {
          super.tick();
 diff --git a/net/minecraft/world/entity/Entity.java b/net/minecraft/world/entity/Entity.java
-index 57cff20212f6d5f83d4b0169bf6aa185a403e1d3..1b554121a550f0a2c7e5d6b041450b4bcba781c5 100644
+index 34ef15867759ebc7296256a6d5ec286eb3a5f895..d3d97b0b6ff6312f1deb0bb8b1beef8b3578bc53 100644
 --- a/net/minecraft/world/entity/Entity.java
 +++ b/net/minecraft/world/entity/Entity.java
 @@ -368,6 +368,15 @@ public abstract class Entity implements SyncedDataHolder, DebugValueSource, Name
@@ -542,10 +542,10 @@ index 5b6020de0848458f5576113e690b5a6435f35d05..6f49b5e5888a6296b929e465a5ef87dc
      public void tick() {
          super.tick();
 diff --git a/net/minecraft/world/entity/Mob.java b/net/minecraft/world/entity/Mob.java
-index 43c3d5a7cb4303d4f4a0de9209ebe4e6c22e1a65..a6ed274cb0cf86a1ca93588f946ed52a58354546 100644
+index 230af192db5e7b81756fd30d63c99be23715cc7a..c24dcd5537d0ca0e706c1794c66a0936912884a7 100644
 --- a/net/minecraft/world/entity/Mob.java
 +++ b/net/minecraft/world/entity/Mob.java
-@@ -217,6 +217,19 @@ public abstract class Mob extends LivingEntity implements EquipmentUser, Leashab
+@@ -218,6 +218,19 @@ public abstract class Mob extends LivingEntity implements EquipmentUser, Leashab
          return this.lookControl;
      }
 

@@ -23,12 +23,13 @@
      public GoalSelector targetSelector;
      private @Nullable LivingEntity target;
      private final Sensing sensing;
-@@ -139,6 +_,8 @@
+@@ -139,6 +_,9 @@
      private Leashable.@Nullable LeashData leashData;
      private BlockPos homePosition = BlockPos.ZERO;
      private int homeRadius = -1;
 +    public boolean aware = true; // CraftBukkit
 +    public net.kyori.adventure.util.TriState despawnInPeacefulOverride = net.kyori.adventure.util.TriState.NOT_SET; // Paper - allow changing despawnInPeaceful
++    public net.kyori.adventure.util.TriState burnInDaylightOverride = net.kyori.adventure.util.TriState.NOT_SET; // Paper - burnInDaylight API
 
      protected Mob(EntityType<? extends Mob> type, Level level) {
          super(type, level);
@@ -85,7 +86,7 @@
      }
 
      @Override
-@@ -371,13 +_,27 @@
+@@ -371,13 +_,32 @@
          if (this.isNoAi()) {
              output.putBoolean("NoAI", this.isNoAi());
          }
@@ -95,6 +96,11 @@
 +            output.putString("Paper.DespawnInPeacefulOverride", this.despawnInPeacefulOverride.name());
 +        }
 +        // Paper end - allow changing despawnInPeaceful
++        // Paper start - burnInDaylight API
++        if (this.burnInDaylightOverride != net.kyori.adventure.util.TriState.NOT_SET) {
++            output.putString("Paper.BurnInDaylightOverride", this.burnInDaylightOverride.name());
++        }
++        // Paper end - burnInDaylight API
      }
 
      @Override
@@ -115,11 +121,12 @@
          this.dropChances = input.read("drop_chances", DropChances.CODEC).orElse(DropChances.DEFAULT);
          this.readLeashData(input);
          this.homeRadius = input.getIntOr("home_radius", -1);
-@@ -389,6 +_,13 @@
+@@ -389,6 +_,14 @@
          this.lootTable = input.read("DeathLootTable", LootTable.KEY_CODEC);
          this.lootTableSeed = input.getLongOr("DeathLootTableSeed", 0L);
          this.setNoAi(input.getBooleanOr("NoAI", false));
 +        this.aware = input.getBooleanOr("Bukkit.Aware", true); // CraftBukkit
++        this.burnInDaylightOverride = input.read("Paper.BurnInDaylightOverride", io.papermc.paper.util.PaperCodecs.TRI_STATE_CODEC).orElse(net.kyori.adventure.util.TriState.NOT_SET); // Paper - burnInDaylight API
 +        // Paper start - allow changing despawnInPeaceful
 +        this.despawnInPeacefulOverride = readDespawnInPeacefulOverride(input);
 +    }
@@ -129,6 +136,15 @@
      }
 
      @Override
+@@ -437,7 +_,7 @@
+     @Override
+     public void aiStep() {
+         super.aiStep();
+-        if (this.getType().is(EntityTypeTags.BURN_IN_DAYLIGHT)) {
++        if (this.burnInDaylightOverride.toBooleanOrElse(this.getType().is(EntityTypeTags.BURN_IN_DAYLIGHT))) { // Paper - burnInDaylight API
+             this.burnUndead();
+         }
+
 @@ -456,6 +_,11 @@
                      && !itemEntity.getItem().isEmpty()
                      && !itemEntity.hasPickUpDelay()

@@ -1,49 +1,27 @@
 --- a/net/minecraft/world/entity/monster/Phantom.java
 +++ b/net/minecraft/world/entity/monster/Phantom.java
-@@ -49,6 +_,10 @@
+@@ -49,6 +_,7 @@
      Vec3 moveTargetPoint = Vec3.ZERO;
      @Nullable public BlockPos anchorPoint;
      Phantom.AttackPhase attackPhase = Phantom.AttackPhase.CIRCLE;
-+    // Paper start
-+    public java.util.@Nullable UUID spawningEntity;
-+    public boolean shouldBurnInDay = true;
-+    // Paper end
++    public java.util.@Nullable UUID spawningEntity; // Paper
 
      public Phantom(EntityType<? extends Phantom> type, Level level) {
          super(type, level);
-@@ -136,6 +_,13 @@
-         }
-     }
-
-+    // Paper start
-+    @Override
-+    public boolean isSunBurnTick() {
-+        return this.shouldBurnInDay && super.isSunBurnTick();
-+    }
-+    // Paper end
-+
-     @Override
-     protected void checkFallDamage(double y, boolean onGround, BlockState state, BlockPos pos) {
-     }
-@@ -164,6 +_,10 @@
+@@ -164,6 +_,8 @@
          super.readAdditionalSaveData(input);
          this.anchorPoint = input.read("anchor_pos", BlockPos.CODEC).orElse(null);
          this.setPhantomSize(input.getIntOr("size", 0));
-+        // Paper start
-+        this.spawningEntity = input.read("Paper.SpawningEntity", net.minecraft.core.UUIDUtil.CODEC).orElse(null);
-+        this.shouldBurnInDay = input.getBooleanOr("Paper.ShouldBurnInDay", true);
-+        // Paper end
++        this.spawningEntity = input.read("Paper.SpawningEntity", net.minecraft.core.UUIDUtil.CODEC).orElse(null); // Paper
++        if (!input.getBooleanOr("Paper.ShouldBurnInDay", true)) super.burnInDaylightOverride = net.kyori.adventure.util.TriState.FALSE; // Paper - burnInDaylight API - read old value
      }
 
      @Override
-@@ -171,6 +_,10 @@
+@@ -171,6 +_,7 @@
          super.addAdditionalSaveData(output);
          output.storeNullable("anchor_pos", BlockPos.CODEC, this.anchorPoint);
          output.putInt("size", this.getPhantomSize());
-+        // Paper start
-+        output.storeNullable("Paper.SpawningEntity", net.minecraft.core.UUIDUtil.CODEC, this.spawningEntity);
-+        output.putBoolean("Paper.ShouldBurnInDay", this.shouldBurnInDay);
-+        // Paper end
++        output.storeNullable("Paper.SpawningEntity", net.minecraft.core.UUIDUtil.CODEC, this.spawningEntity); // Paper
      }
 
      @Override

@@ -1,35 +1,5 @@
 --- a/net/minecraft/world/entity/monster/skeleton/AbstractSkeleton.java
 +++ b/net/minecraft/world/entity/monster/skeleton/AbstractSkeleton.java
-@@ -66,6 +_,7 @@
-             AbstractSkeleton.this.setAggressive(true);
-         }
-     };
-+    private boolean shouldBurnInDay = true; // Paper - shouldBurnInDay API
-
-     protected AbstractSkeleton(EntityType<? extends AbstractSkeleton> type, Level level) {
-         super(type, level);
-@@ -90,6 +_,21 @@
-         return Monster.createMonsterAttributes().add(Attributes.MOVEMENT_SPEED, 0.25);
-     }
-
-+    // Paper start - shouldBurnInDay API
-+    public boolean shouldBurnInDay() {
-+        return this.shouldBurnInDay;
-+    }
-+
-+    public void setShouldBurnInDay(boolean shouldBurnInDay) {
-+        this.shouldBurnInDay = shouldBurnInDay;
-+    }
-+
-+    @Override
-+    public boolean isSunBurnTick() {
-+        return this.shouldBurnInDay && super.isSunBurnTick();
-+    }
-+    // Paper end - shouldBurnInDay API
-+
-     @Override
-     protected void playStepSound(BlockPos pos, BlockState block) {
-         this.playSound(this.getStepSound(), 0.15F, 1.0F);
 @@ -120,7 +_,7 @@
          this.populateDefaultEquipmentSlots(random, difficulty);
          this.populateDefaultEquipmentEnchantments(level, random, difficulty);
@@ -72,28 +42,17 @@
          }
 
          this.playSound(SoundEvents.SKELETON_SHOOT, 1.0F, 1.0F / (this.getRandom().nextFloat() * 0.4F + 0.8F));
-@@ -192,11 +_,22 @@
+@@ -192,11 +_,14 @@
      protected void readAdditionalSaveData(ValueInput input) {
          super.readAdditionalSaveData(input);
          this.reassessWeaponGoal();
--    }
--
--    @Override
++        if (!input.getBooleanOr("Paper.ShouldBurnInDay", true)) super.burnInDaylightOverride = net.kyori.adventure.util.TriState.FALSE; // Paper - burnInDaylight API - read old value
+     }
+
+     @Override
 -    public void onEquipItem(EquipmentSlot slot, ItemStack oldItem, ItemStack newItem) {
 -        super.onEquipItem(slot, oldItem, newItem);
-+        this.shouldBurnInDay = input.getBooleanOr("Paper.ShouldBurnInDay", true); // Paper - shouldBurnInDay API
-+    }
-+
-+    // Paper start - shouldBurnInDay API
-+    @Override
-+    protected void addAdditionalSaveData(final net.minecraft.world.level.storage.ValueOutput output) {
-+        super.addAdditionalSaveData(output);
-+        output.putBoolean("Paper.ShouldBurnInDay", this.shouldBurnInDay);
-+    }
-+    // Paper end - shouldBurnInDay API
-+
 +    // Paper start - silent equipping
-+    @Override
 +    public void onEquipItem(EquipmentSlot slot, ItemStack oldItem, ItemStack newItem, boolean silent) {
 +        super.onEquipItem(slot, oldItem, newItem, silent);
 +        // Paper end - silent equipping

@@ -11,7 +11,7 @@
      private static final Identifier REINFORCEMENT_CALLER_CHARGE_ID = Identifier.withDefaultNamespace("reinforcement_caller_charge");
      private static final AttributeModifier ZOMBIE_REINFORCEMENT_CALLEE_CHARGE = new AttributeModifier(
          Identifier.withDefaultNamespace("reinforcement_callee_charge"), -0.05F, AttributeModifier.Operation.ADD_VALUE
-@@ -90,13 +_,15 @@
+@@ -90,13 +_,14 @@
      private static final boolean DEFAULT_BABY = false;
      private static final boolean DEFAULT_CAN_BREAK_DOORS = false;
      private static final int DEFAULT_IN_WATER_TIME = 0;
@@ -20,7 +20,6 @@
      private boolean canBreakDoors = false;
      private int inWaterTime = 0;
      public int conversionTime;
-+    private boolean shouldBurnInDay = true; // Paper - Add more Zombie API
 
      public Zombie(EntityType<? extends Zombie> type, Level level) {
          super(type, level);
@@ -90,7 +89,7 @@
      public void startUnderWaterConversion(int conversionTime) {
          this.conversionTime = conversionTime;
          this.getEntityData().set(DATA_DROWNED_CONVERSION_ID, true);
-@@ -240,31 +_,50 @@
+@@ -240,26 +_,39 @@
      }
 
      protected void convertToZombieType(ServerLevel level, EntityType<? extends Zombie> entityType) {
@@ -137,19 +136,6 @@
      }
 
      public boolean isSunSensitive() {
--        return true;
--    }
-+        return this.shouldBurnInDay; // Paper - Add more Zombie API
-+    }
-+
-+    // Paper start - Add more Zombie API
-+    public void setShouldBurnInDay(boolean shouldBurnInDay) {
-+        this.shouldBurnInDay = shouldBurnInDay;
-+    }
-+    // Paper end - Add more Zombie API
-
-     @Override
-     public boolean hurtServer(ServerLevel level, DamageSource damageSource, float amount) {
 @@ -297,13 +_,13 @@
                      if (SpawnPlacements.isSpawnPositionOk(type, level, blockPos)
                          && SpawnPlacements.checkSpawnRules(type, level, EntitySpawnReason.REINFORCEMENT, blockPos, level.random)) {
@@ -181,19 +167,11 @@
              }
          }
 
-@@ -390,6 +_,7 @@
-         output.putBoolean("CanBreakDoors", this.canBreakDoors());
-         output.putInt("InWaterTime", this.isInWater() ? this.inWaterTime : -1);
-         output.putInt("DrownedConversionTime", this.isUnderWaterConverting() ? this.conversionTime : -1);
-+        output.putBoolean("Paper.ShouldBurnInDay", this.shouldBurnInDay); // Paper - Add more Zombie API
-     }
-
-     @Override
 @@ -404,13 +_,15 @@
          } else {
              this.getEntityData().set(DATA_DROWNED_CONVERSION_ID, false);
          }
-+        this.shouldBurnInDay = input.getBooleanOr("Paper.ShouldBurnInDay", true); // Paper - Add more Zombie API
++        if (!input.getBooleanOr("Paper.ShouldBurnInDay", true)) super.burnInDaylightOverride = net.kyori.adventure.util.TriState.FALSE; // Paper - burnInDaylight API - read old value
      }
 
      @Override