Plain ol' skeles
Note: Minify the command to avoid issues :)
MINER SKELETON!
Crazy Negative Potion!
SUMMON SKELETONS!
New 3rd Boss! Pretty Hard! Good for ending of Minecraft!
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)