This is not a boss battle just a hard zombie
Note: Minify the command to avoid issues :)
Rocket Shot Bow
Iron Skin Potion
Blaze Melee Upgrade
Smoke Bomb(potion of blindness XD)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)