A wither skeleton with the head of a enderman.
Note: Minify the command to avoid issues :)
CAVE SPIDER WEARING DIAMOND BLOCK!!!!!
Green Leather Helmet
Herobrine entered the world.
Shield 4 Minecraft
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)