A couple of good friends of mine are in Cannibal Red. They are always a good time. They are a deathcore-ish band, as you mentioned Nat, but with a little hint of black metal.
My buddy who works at Peabody's showed me a picture of the stage after Watain was done...wow! It was just a mess of blood, bile, animal hair and dead, rotted flesh. I can't imagine how bad the smell was...