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Note: Minify the command to avoid issues :)
Evil Golems in 1 command
Fish Warrior Mini boss battle (1.8,1.9)
More mobs in 2 command (Second one below}
TROLL YOUR FRIENDS WITH THIS!
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)