Better to call it a demon:
Wither skeleton with an elytra, sheild and sword
Note: Minify the command to avoid issues :)
Fist of Fire
instant death poition
Samp Mist 1
Troll's Creeper spawner (Nuclear Creeper)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)