--- a/net/minecraft/world/entity/boss/enderdragon/EntityEnderDragon.java
+++ b/net/minecraft/world/entity/boss/enderdragon/EntityEnderDragon.java
@@ -53,6 +53,19 @@
 import org.joml.Vector3f;
 import org.slf4j.Logger;
 
+// CraftBukkit start
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.Explosion;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.entity.TileEntity;
+import net.minecraft.world.level.storage.loot.LootParams;
+import net.minecraft.world.level.storage.loot.LootTableInfo;
+import net.minecraft.world.level.storage.loot.parameters.LootContextParameters;
+import org.bukkit.craftbukkit.block.CraftBlock;
+import org.bukkit.event.entity.EntityExplodeEvent;
+import org.bukkit.event.entity.EntityRegainHealthEvent;
+// CraftBukkit end
+
 public class EntityEnderDragon extends EntityInsentient implements IMonster {
 
     private static final Logger LOGGER = LogUtils.getLogger();
@@ -90,6 +103,7 @@
     private final PathPoint[] nodes;
     private final int[] nodeAdjacency;
     private final Path openSet;
+    private final Explosion explosionSource; // CraftBukkit - reusable source for CraftTNTPrimed.getSource()
 
     public EntityEnderDragon(EntityTypes<? extends EntityEnderDragon> entitytypes, World world) {
         super(EntityTypes.ENDER_DRAGON, world);
@@ -111,6 +125,7 @@
         this.noPhysics = true;
         this.noCulling = true;
         this.phaseManager = new DragonControllerManager(this);
+        this.explosionSource = new Explosion(world, this, null, null, Double.NaN, Double.NaN, Double.NaN, Float.NaN, true, Explosion.Effect.DESTROY, Particles.EXPLOSION, Particles.EXPLOSION_EMITTER, SoundEffects.GENERIC_EXPLODE); // CraftBukkit
     }
 
     public void setDragonFight(EnderDragonBattle enderdragonbattle) {
@@ -258,7 +273,7 @@
 
                     Vec3D vec3d1 = idragoncontroller.getFlyTargetLocation();
 
-                    if (vec3d1 != null) {
+                    if (vec3d1 != null && idragoncontroller.getPhase() != DragonControllerPhase.HOVERING) { // CraftBukkit - Don't move when hovering
                         double d0 = vec3d1.x - this.getX();
                         double d1 = vec3d1.y - this.getY();
                         double d2 = vec3d1.z - this.getZ();
@@ -399,7 +414,14 @@
             if (this.nearestCrystal.isRemoved()) {
                 this.nearestCrystal = null;
             } else if (this.tickCount % 10 == 0 && this.getHealth() < this.getMaxHealth()) {
-                this.setHealth(this.getHealth() + 1.0F);
+                // CraftBukkit start
+                EntityRegainHealthEvent event = new EntityRegainHealthEvent(this.getBukkitEntity(), 1.0F, EntityRegainHealthEvent.RegainReason.ENDER_CRYSTAL);
+                this.level().getCraftServer().getPluginManager().callEvent(event);
+
+                if (!event.isCancelled()) {
+                    this.setHealth((float) (this.getHealth() + event.getAmount()));
+                }
+                // CraftBukkit end
             }
         }
 
@@ -474,6 +496,9 @@
         int j1 = MathHelper.floor(axisalignedbb.maxZ);
         boolean flag = false;
         boolean flag1 = false;
+        // CraftBukkit start - Create a list to hold all the destroyed blocks
+        List<org.bukkit.block.Block> destroyedBlocks = new java.util.ArrayList<org.bukkit.block.Block>();
+        // CraftBukkit end
 
         for (int k1 = i; k1 <= l; ++k1) {
             for (int l1 = j; l1 <= i1; ++l1) {
@@ -483,7 +508,11 @@
 
                     if (!iblockdata.isAir() && !iblockdata.is(TagsBlock.DRAGON_TRANSPARENT)) {
                         if (this.level().getGameRules().getBoolean(GameRules.RULE_MOBGRIEFING) && !iblockdata.is(TagsBlock.DRAGON_IMMUNE)) {
-                            flag1 = this.level().removeBlock(blockposition, false) || flag1;
+                            // CraftBukkit start - Add blocks to list rather than destroying them
+                            // flag1 = this.level().removeBlock(blockposition, false) || flag1;
+                            flag1 = true;
+                            destroyedBlocks.add(CraftBlock.at(this.level(), blockposition));
+                            // CraftBukkit end
                         } else {
                             flag = true;
                         }
@@ -492,6 +521,51 @@
             }
         }
 
+        // CraftBukkit start - Set off an EntityExplodeEvent for the dragon exploding all these blocks
+        // SPIGOT-4882: don't fire event if nothing hit
+        if (!flag1) {
+            return flag;
+        }
+
+        org.bukkit.entity.Entity bukkitEntity = this.getBukkitEntity();
+        EntityExplodeEvent event = new EntityExplodeEvent(bukkitEntity, bukkitEntity.getLocation(), destroyedBlocks, 0F);
+        bukkitEntity.getServer().getPluginManager().callEvent(event);
+        if (event.isCancelled()) {
+            // This flag literally means 'Dragon hit something hard' (Obsidian, White Stone or Bedrock) and will cause the dragon to slow down.
+            // We should consider adding an event extension for it, or perhaps returning true if the event is cancelled.
+            return flag;
+        } else if (event.getYield() == 0F) {
+            // Yield zero ==> no drops
+            for (org.bukkit.block.Block block : event.blockList()) {
+                this.level().removeBlock(new BlockPosition(block.getX(), block.getY(), block.getZ()), false);
+            }
+        } else {
+            for (org.bukkit.block.Block block : event.blockList()) {
+                org.bukkit.Material blockId = block.getType();
+                if (blockId.isAir()) {
+                    continue;
+                }
+
+                CraftBlock craftBlock = ((CraftBlock) block);
+                BlockPosition blockposition = craftBlock.getPosition();
+
+                Block nmsBlock = craftBlock.getNMS().getBlock();
+                if (nmsBlock.dropFromExplosion(explosionSource)) {
+                    TileEntity tileentity = craftBlock.getNMS().hasBlockEntity() ? this.level().getBlockEntity(blockposition) : null;
+                    LootParams.a loottableinfo_builder = (new LootParams.a((WorldServer) this.level())).withParameter(LootContextParameters.ORIGIN, Vec3D.atCenterOf(blockposition)).withParameter(LootContextParameters.TOOL, ItemStack.EMPTY).withParameter(LootContextParameters.EXPLOSION_RADIUS, 1.0F / event.getYield()).withOptionalParameter(LootContextParameters.BLOCK_ENTITY, tileentity);
+
+                    craftBlock.getNMS().getDrops(loottableinfo_builder).forEach((itemstack) -> {
+                        Block.popResource(this.level(), blockposition, itemstack);
+                    });
+                    craftBlock.getNMS().spawnAfterBreak((WorldServer) this.level(), blockposition, ItemStack.EMPTY, false);
+                }
+                nmsBlock.wasExploded(this.level(), blockposition, explosionSource);
+
+                this.level().removeBlock(blockposition, false);
+            }
+        }
+        // CraftBukkit end
+
         if (flag1) {
             BlockPosition blockposition1 = new BlockPosition(i + this.random.nextInt(l - i + 1), j + this.random.nextInt(i1 - j + 1), k + this.random.nextInt(j1 - k + 1));
 
@@ -556,6 +630,21 @@
 
     }
 
+    // CraftBukkit start - SPIGOT-2420: Special case, the ender dragon drops 12000 xp for the first kill and 500 xp for every other kill and this over time.
+    @Override
+    public int getExpReward() {
+        // CraftBukkit - Moved from #tickDeath method
+        boolean flag = this.level().getGameRules().getBoolean(GameRules.RULE_DOMOBLOOT);
+        short short0 = 500;
+
+        if (this.dragonFight != null && !this.dragonFight.hasPreviouslyKilledDragon()) {
+            short0 = 12000;
+        }
+
+        return flag ? short0 : 0;
+    }
+    // CraftBukkit end
+
     @Override
     protected void tickDeath() {
         if (this.dragonFight != null) {
@@ -571,15 +660,20 @@
             this.level().addParticle(Particles.EXPLOSION_EMITTER, this.getX() + (double) f, this.getY() + 2.0D + (double) f1, this.getZ() + (double) f2, 0.0D, 0.0D, 0.0D);
         }
 
+        // CraftBukkit start - SPIGOT-2420: Moved up to #getExpReward method
+        /*
         boolean flag = this.level().getGameRules().getBoolean(GameRules.RULE_DOMOBLOOT);
         short short0 = 500;
 
         if (this.dragonFight != null && !this.dragonFight.hasPreviouslyKilledDragon()) {
             short0 = 12000;
         }
+        */
+        int short0 = expToDrop;
+        // CraftBukkit end
 
         if (this.level() instanceof WorldServer) {
-            if (this.dragonDeathTime > 150 && this.dragonDeathTime % 5 == 0 && flag) {
+            if (this.dragonDeathTime > 150 && this.dragonDeathTime % 5 == 0 && true) {  // CraftBukkit - SPIGOT-2420: Already checked for the game rule when calculating the xp
                 EntityExperienceOrb.award((WorldServer) this.level(), this.position(), MathHelper.floor((float) short0 * 0.08F));
             }
 
@@ -590,7 +684,7 @@
 
         this.move(EnumMoveType.SELF, new Vec3D(0.0D, 0.10000000149011612D, 0.0D));
         if (this.dragonDeathTime == 200 && this.level() instanceof WorldServer) {
-            if (flag) {
+            if (true) { // CraftBukkit - SPIGOT-2420: Already checked for the game rule when calculating the xp
                 EntityExperienceOrb.award((WorldServer) this.level(), this.position(), MathHelper.floor((float) short0 * 0.2F));
             }
 
@@ -811,6 +905,7 @@
         super.addAdditionalSaveData(nbttagcompound);
         nbttagcompound.putInt("DragonPhase", this.phaseManager.getCurrentPhase().getPhase().getId());
         nbttagcompound.putInt("DragonDeathTime", this.dragonDeathTime);
+        nbttagcompound.putInt("Bukkit.expToDrop", expToDrop); // CraftBukkit - SPIGOT-2420: The ender dragon drops xp over time which can also happen between server starts
     }
 
     @Override
@@ -824,6 +919,11 @@
             this.dragonDeathTime = nbttagcompound.getInt("DragonDeathTime");
         }
 
+        // CraftBukkit start - SPIGOT-2420: The ender dragon drops xp over time which can also happen between server starts
+        if (nbttagcompound.contains("Bukkit.expToDrop")) {
+            this.expToDrop = nbttagcompound.getInt("Bukkit.expToDrop");
+        }
+        // CraftBukkit end
     }
 
     @Override
