>>718825034 (OP)
as always, with everything, the best answer is modded Skyrim because developers don't fucking know what we want so we have to do it ourselves.
there's also a lich mod for Divinity Original Sin 2 that's alright but kind of OP.
Neverwinter Nights has a mod, the PRC, that adds tons of shit from tabletop and you can be a lich, there, too.
additionally you can be one in Elin, the sequel to popular freeware game Elona, and they're good mages.