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Note: Minify the command to avoid issues :)
Archer Boss
More mobs: Burning skeletons 1.8.7 (Read The comments)
TROLL YOUR FRIENDS WITH THIS!
Armored Dragon (impossible boss battle)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)