Especially if they're in the same situation as Ainz, but of the light side. I kind of forgot a lot of details regarding Overlord, but I stumbled upon this Subreddit just now and remembered how much I searched for fanfics regarding this 3 years ago.

I still have the bookmarks of the fanfics that I've read that are similar enough, so for reference:

Overlords of the Elven Dominion - I have forgotten if Nazarick was their main enemy, but their race is elves, so... maybe. I vaguely remember stopping on the first few chapters. So I think this fits the bill the most.

and

Gods of a New World - Aizen got transported into this world, and proceeds to do OP stuff like>! creating an entire spiritual plane of Hueco Mundo and inserting his own powers to his would be followers.!<