Dark, evil death metal like Incantation and Immolation.

Teitanblood is an excellent dark Death/Black band, seven chalices is a fantastic release.

Also Cruciamentum's demo sounds like the type of thing you're looking for, it's an excellent release.
 
im pretty sure that 'Azarath' is one of the bands that always misses a mention..may top this list too
evil riffs, evil drumming, evil atmosphere..
infact, Bart, the lead guitarist, cites immolation as his biggest influence..and what better treat than to listen to Inferno in rogue mode outside his clean precise drumming with Behemoth