It has fly hacks. Go ban it.
Note: Minify the command to avoid issues :)
Skeletal Horseman Enemy!
Crash a server with this tool
Insane Custom Boss Mob Spawner!?
Ghostly Horseman Boss
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)