do you guys know any? where the MC is evil with capital E, sacrificing people in gruesome Blood rituals and betraying his friends/Family for fun and profit and even in normal interactions he displays casual Cruelty in dialogues. Evil for Evil's sake or because it's fun to him or because it lets him achieve his goals easier. It can be Original or Fanfiction.


no Xanxia though I feel like those are real hypocrites in that the author intends them to be good guys but are really just a bunch of jerks to everyone around them.

I recommend Reverend insanity. It has translated novel of great quality. The MC did all of the above and worse for power. Not realy xianxian even though it is posted on  a website full of those awful xianxian novels you described.
The story is currently  at 1400 chapter at  12 min reading time a piece.
Official translation  at webnovel.com, there are others...
Give it a try, I doubt  you will regret it.