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Note: Minify the command to avoid issues :)
Command Science Boss battle
SkeletalMage 1.11.2
More Mobs: Frozen Zombies in 1 command. 1.8.7 (Read The comments)
Fish Warrior Mini boss battle (1.8,1.9)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)