Alright, I remember seeing a feat a while ago that was not homebrew and not dragon material:
It's prerequisites included that you had to be at least 6th level, it had the standard "your soul is going to hell for taking this feat" clause, and it gave two different benefits, one for casters and one for melee-ers (the casters got a CL bump, iirc, and the warriors got a boost to damage, again iirc).
The important thing about the feat is that it changed your type to outsider and gave you the Evil subtype.
Thing is, now I can't find it anywhere; so, if anyone sees it...
I need it for a build.