Yeah, I'll second Nile for the Babylonian/Ancient Egyptian mythology metal. Pretty much all of their songs deal with that, although if you don't like semi-brutal Death Metal then you probably wont like them.
On an entirely different note, I'm not sure if
Baroness' Blue Record has been discussed on these threads yet. Anyways, post-sludge metal FTW. Anyone else think this is one of the most underrated albums ever? It's probably my favorite album of the last few years.