This command setting Ender Dragon spawner on your coordinates
Note: Minify the command to avoid issues :)
Create scoreboard with players health
Give me Herobrine Head
(/setblock) Ender Dragon mob spawner
Sign used for stop server (multiplayer)
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)