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Note: Minify the command to avoid issues :)
Hostile Archer (1.9.1)
Zombie Horseman (1.9.1)
Better EnderDragon (4 commands)
HOW TO THROW FIREBALLS
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)