I used MrGarretto's command combiner, so this is not entirely mine.
Note: Minify the command to avoid issues :)
Spidey sense, Bane strength and space mechanics in one command block!
STARK Package
Stormtrooper *1.9. NEW!*
EXTREME boss battle!
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)