Apollyon is a black metal/thrash metal multi-instrumentalist, formerly associated with Dødheimsgard, Cadaver and Immortal, now playing in Aura Noir. He has done guest vocals on the Darkthrone albums Plaguewielder and Sardonic Wrath, and also on Audiopain's EP 1986 (2000). He was a live guitarist for Gorgoroth from 2003 to 2004, and performed at Gorgoroth's infamous Kraków show in February 2004 and later released on the video album Black Mass Krakow 2004.