This has probably been asked a few times before

[Goober]

What kind of guitar distortion do they use on the ressurection through carnage album? it sounds way badass, but i have no clue what it is..

 

[Skaldir]

Yes, it has
It's the Boss "Heavy Metal" pedal. Blakkheim himself tells something about the setup.

http://www.ultimatemetal.com/forum/showthread.php?t=209134&highlight=boss+heavy+metal

 

[Sinister Mephisto]

I think it sounds like ass. But it's kind of a cool effect.