This command was made for my 1k subscriber special. This command adds a boss that has 2 different phases. The first phase he will do a lot of magic attacks while you are trying to attack his crystal above his head. After you hit his crystal 20 times, he will come down and fight you. During that time, he will constantly teleport to you and spawn endermites. After he dies, you will be rewarded but riches and cake!

Command: http://pastebin.com/cnHrcGN9 (1.9+)

Video for Explanation: