As the title says, I am trying to make a Truly Evil Lich and I have base inspiration from the Cartoon Show Adventure Time, specifically the antagonist referred to as Lich.

That Lich sought the death of the Multiverse, total zero, as if trying to pull an Azathoth.

I'm in the process of trying to create this, and I want to know what you guys n' gals think, alongside any brainstorming or ideas you all'd like to contribute!

Oh and it's not for any campaign, I just want to create another Villain for future use!

EDIT: Why not regale me with any downright mean as a rattlesnake stories of your experiences, Player and/or DM, with a Lich in a campaign? I'd love to get as many perspectives as possible!

EDIT 2: THANK YOU FOR THE INPUT, I am already scheming with ideas!! :D