Yeah, but fast healing doesn't account for regrowing parts. I'd stick with regeneration, and maybe make him vulnerable to the same types of damage that clear his damage reduction.
we can do jormy in between the titans and the devil lords.
as for prometheus, his spell-likes should look a lot different than most of the rest of these guys. for one thing, besides him being good, there will be much less emphasis on chaos... let me see if i can get a basic list put together today before i go home.