Wither skeletons will now drop necrotic bones and respect beheading

src/main/java/crazypants/enderio/entity/EntityWitherSkeleton.java

@@ -1,15 +1,22 @@
 package crazypants.enderio.entity;
 
+import java.util.Calendar;
+
+import net.minecraft.enchantment.EnchantmentHelper;
+import net.minecraft.entity.EntityLivingBase;
 import net.minecraft.entity.IEntityLivingData;
 import net.minecraft.entity.SharedMonsterAttributes;
 import net.minecraft.entity.ai.attributes.AttributeModifier;
 import net.minecraft.entity.monster.EntitySkeleton;
+import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.init.Blocks;
 import net.minecraft.init.Items;
+import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.DamageSource;
 import net.minecraft.world.World;
-
-import java.util.Calendar;
+import cpw.mods.fml.common.registry.GameRegistry;
+import crazypants.util.EntityUtil;
 
 public class EntityWitherSkeleton extends EntitySkeleton {
   public EntityWitherSkeleton(World world) {
@@ -54,4 +61,33 @@ public class EntityWitherSkeleton extends EntitySkeleton {
   public int getSkeletonType() {
     return 1;
   }
+
+  @Override
+  public void onDeath(DamageSource source) {
+    super.onDeath(source);
+    if(source.damageType.equals("player")) {
+      EntityPlayer player = (EntityPlayer) source.getEntity();
+      ItemStack stack = player.getCurrentEquippedItem();
+      if(stack != null && stack.hasTagCompound()) {
+        Item cleaver = GameRegistry.findItem("TConstruct", "cleaver");
+        int beheading = stack.getTagCompound().getCompoundTag("InfiTool").getInteger("Beheading");
+        if(stack.getItem() == cleaver) {
+          beheading += 2;
+        }
+        System.out.println(beheading);
+        if(beheading > 0 && worldObj.rand.nextInt(100) < beheading * 10) {
+          EntityUtil.spawnItemInWorldWithRandomMotion(worldObj, new ItemStack(Items.skull, 1, 1), posX, posY, posZ);
+        }
+      }
+    }
+    if(source.getEntity() instanceof EntityLivingBase) {
+      int lootingLevel = EnchantmentHelper.getLootingModifier((EntityLivingBase) source.getEntity());
+      if(worldObj.rand.nextInt(Math.max(1, 1 - lootingLevel)) == 0) {
+        Item necroticBone = GameRegistry.findItem("TConstruct", "materials");
+        if(necroticBone != null) {
+          EntityUtil.spawnItemInWorldWithRandomMotion(worldObj, new ItemStack(necroticBone, 1, 8), posX, posY, posZ);
+        }
+      }
+    }
+  }
 }

src/main/java/crazypants/util/EntityUtil.java

@@ -5,18 +5,18 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
-import crazypants.vecmath.Vector3d;
-
 import net.minecraft.block.Block;
 import net.minecraft.entity.Entity;
 import net.minecraft.entity.EntityList;
 import net.minecraft.entity.EntityLiving;
 import net.minecraft.entity.boss.IBossDisplayData;
-import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.item.EntityItem;
+import net.minecraft.item.ItemStack;
 import net.minecraft.util.AxisAlignedBB;
 import net.minecraft.util.MathHelper;
 import net.minecraft.util.StatCollector;
 import net.minecraft.world.World;
+import crazypants.vecmath.Vector3d;
 
 public class EntityUtil {
 
@@ -65,5 +65,30 @@ public class EntityUtil {
     }
     return collidingBoundingBoxes;
   }
-  
+
+  public static void spawnItemInWorldWithRandomMotion(World world, ItemStack item, int x, int y, int z) {
+    if(item != null) {
+      spawnItemInWorldWithRandomMotion(world, item, x + 0.5, y + 0.5, z + 0.5);
+    }
+  }
+
+  public static void spawnItemInWorldWithRandomMotion(World world, ItemStack item, double x, double y, double z) {
+    if(item != null) {
+      spawnItemInWorldWithRandomMotion(new EntityItem(world, x, y, z, item));
+    }
+  }
+
+  public static void spawnItemInWorldWithRandomMotion(EntityItem entity) {
+    entity.delayBeforeCanPickup = 10;
+
+    float f = (entity.worldObj.rand.nextFloat() * 0.1f) - 0.05f;
+    float f1 = (entity.worldObj.rand.nextFloat() * 0.1f) - 0.05f;
+    float f2 = (entity.worldObj.rand.nextFloat() * 0.1f) - 0.05f;
+
+    entity.motionX += f;
+    entity.motionY += f1;
+    entity.motionZ += f2;
+
+    entity.worldObj.spawnEntityInWorld(entity);
+  }
 }