VERY WEAK!
Note: Minify the command to avoid issues :)
HOW TO THROW FIREBALLS
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1.9 YOU WILL NEVER SEE SOMETHING LIKE THAT!
Armored Dragon (impossible boss battle)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)