Tirek has stolen all the magic in the entire universe, and everything would be under his tyrannical rule forever...if it weren't for a certain Super Saiyan Blue that came to stop him, Goku.
Now, Goku must do battle with the strongest being to ever exist in this dimmension.
I think this should be obvious, but major spoilers for Dragon Ball Super, so if you aren't up to date with the show, you won't understand some things (oh, and p.s. this is going to be a lot more action involved than my other story, which is more about the journey to fight Tirek rather than the battle itself).