This is a 1.11 /summon command that summons a headless horseman!
Note: Minify the command to avoid issues :)
Headless Horseman (1.11 /summon command)
FIRE SWORD
Two awesome castles
Venom (1.11 Black Spider-Man)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)