The Reaper!
Note: Minify the command to avoid issues :)
Sword of Nether
Nether Cyclops. IN HELL (nomods!)
SKY CYCLOPS! Companion of Zeus!
FNAF (Freddy Fazbear
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)