Aster was once a 15 year old outcast- now he's the literal embodiment of mayhem and havoc and is basically adopted by Discord. Oh, and he's also trying to reform what will soon become The Leigon Of Doom. Surely this can't go wrong at all!
A forgotten expirement from a dark time in Equestria rises to claim the throne. and now, with the Mane Six out of action. It falls to a ragtag group of reformed villians to restore the harmony.