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Note: Minify the command to avoid issues :)
Angry Pigzombie (1.9.1)
...
Ghost (1.9.1)
FLYING MOBS!!! (Are flying only if you spawn him in the air) (no gravity)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)