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Note: Minify the command to avoid issues :)
More mobs:Nature skeletons 1.8.7 (Read the comments!)
Skeleton Knight (1.9.1)
RIDE THE ENDER DRAGON !!!!!!!!!!
Chicken Jockey Jockey (1.9.1)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)