This command setting Ender Dragon spawner on your coordinates
Note: Minify the command to avoid issues :)
(/setblock) Ender Dragon mob spawner
Create scoreboard with players health
Give me Elytra (21w11a)
Give me chest with 64 netherite blocks
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)