Hi, I created some awesome new boss mobs using command blocks. The heads represent the difficulty of the boss. Warning: These 4 head bosses are almost impossible to kill with ordinary weapons. Have fun!!! 

Oh and thanks IJAMinecraft for the castle. 

https://www.youtube.com/user/IJAMinecraft 

https://www.youtube.com/watch?v=MARuHGGQW6w 

IJAMinecraft said that I may use use his work in my projects as long as I credit him, so yeah, there are the citations.