This is a parody, and is not endorsed by Cartoon Network, or the people who make Steven Universe. This is purely for fun.
Wasn't the Lich not the baddest guy though...?
Orgalorg was a bit more galactic level entity and more of a random jerk. I personally feel the Lich was a far more personal and wicked villain and for it greater than that Cthulhu wannabe.
Bella Noche the anti magic being...might qualify but we didn't see enough to really get a good picture for me to honestly evaluate.