Dr Trayaurus from DanTDM!
Note: Minify the command to avoid issues :)
Get a Zombie Pigman Skull!
Spawn The Wither!!!!!!!
Potion of Regeneration That Lasts For an Hour!!!!
Creeper Armor!
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)