PaperMC/paper-server/nms-patches/net/minecraft/world/entity/projectile/EntityLargeFireball.patch

--- a/net/minecraft/world/entity/projectile/EntityLargeFireball.java
+++ b/net/minecraft/world/entity/projectile/EntityLargeFireball.java
@@ -13,17 +13,24 @@
 import net.minecraft.world.phys.MovingObjectPositionEntity;
 import net.minecraft.world.phys.Vec3D;
 
+// CraftBukkit start
+import org.bukkit.event.entity.EntityRemoveEvent;
+import org.bukkit.event.entity.ExplosionPrimeEvent;
+// CraftBukkit end
+
 public class EntityLargeFireball extends EntityFireballFireball {
 
     public int explosionPower = 1;
 
     public EntityLargeFireball(EntityTypes<? extends EntityLargeFireball> entitytypes, World world) {
         super(entitytypes, world);
+        isIncendiary = this.level().getGameRules().getBoolean(GameRules.RULE_MOBGRIEFING); // CraftBukkit
     }
 
     public EntityLargeFireball(World world, EntityLiving entityliving, Vec3D vec3d, int i) {
         super(EntityTypes.FIREBALL, entityliving, vec3d, world);
         this.explosionPower = i;
+        isIncendiary = this.level().getGameRules().getBoolean(GameRules.RULE_MOBGRIEFING); // CraftBukkit
     }
 
     @Override
@@ -32,8 +39,16 @@
         if (!this.level().isClientSide) {
             boolean flag = this.level().getGameRules().getBoolean(GameRules.RULE_MOBGRIEFING);
 
-            this.level().explode(this, this.getX(), this.getY(), this.getZ(), (float) this.explosionPower, flag, World.a.MOB);
-            this.discard();
+            // CraftBukkit start - fire ExplosionPrimeEvent
+            ExplosionPrimeEvent event = new ExplosionPrimeEvent((org.bukkit.entity.Explosive) this.getBukkitEntity());
+            this.level().getCraftServer().getPluginManager().callEvent(event);
+
+            if (!event.isCancelled()) {
+                // give 'this' instead of (Entity) null so we know what causes the damage
+                this.level().explode(this, this.getX(), this.getY(), this.getZ(), event.getRadius(), event.getFire(), World.a.MOB);
+            }
+            // CraftBukkit end
+            this.discard(EntityRemoveEvent.Cause.HIT); // CraftBukkit - add Bukkit remove cause
         }
 
     }
@@ -63,7 +78,8 @@
     public void readAdditionalSaveData(NBTTagCompound nbttagcompound) {
         super.readAdditionalSaveData(nbttagcompound);
         if (nbttagcompound.contains("ExplosionPower", 99)) {
-            this.explosionPower = nbttagcompound.getByte("ExplosionPower");
+            // CraftBukkit - set bukkitYield when setting explosionpower
+            bukkitYield = this.explosionPower = nbttagcompound.getByte("ExplosionPower");
         }
 
     }