Ride a horse while being covered by an ender dragon:
Note: Minify the command to avoid issues :)
WORD CHEST TROLL
GLOWING ARMOR STAND TUTORIAL
MEDICINE DEALER
I DON'T KNOW WHAT EXACTLY :|
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)