Mojang decided that no gravity mobs can't move on their own, so gg.
Achtung: Minifiziere den Command um Probleme zu vermeiden :)
Summon a slutty zombie
Giant/Ghast combo boss
XP spawner
Grab bag of commands used for always active repeating command blocks
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)