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Note: Minify the command to avoid issues :)
Skeleton Archer (1.9.1)
Ghostly Horseman (1.9.1)
Weather Controler in 3 commands
BlazedWither boss (Literally unkillable) Read the comments
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)