This is not a boss battle just a hard zombie
Note: Minify the command to avoid issues :)
Mario Mushroom
Super Powered Wither
SUPER OP DIRT HELMET
Colour ANY Block!(By team wooloo)(Suggested by simply sarc)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)