YOU WOLD"NT TRY TO KILL ME HAHAHAHAHA!!!
Note: Minify the command to avoid issues :)
Iron Shield one command_block
particles NO MODS!!!
Army Unit one command_block
Emerald KING!!!
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)