King joined the Bergen-based black metal band
Gorgoroth as a bassist in 1999, shortly before the recording of their fifth album
Incipit Satan. In 2002, he co-founded the rock band
Audrey Horne. King wrote the majority of the music for the Gorgoroth sixth studio album,
Twilight of the Idols, released in 2003. The following year King formed the doom metal band
Sahg with Gorgoroth drummer
Einar Selvik and
Thomas Tofthagen of Audrey Horne. In 2005, Audrey Horne released their debut album
No Hay Banda and won the Norwegian
Spellemann Award in the 'Metal' category. Sahg released their first studio album
Sahg I in 2006. King further collaborated with Einar Selvik that same year in the black metal band Jotunspor and on their album
Gleipnirs Smeder. King composed all the music for Gorgoroth's 2006 album
Ad Majorem Sathanas Gloriam. The album was nominated for a Spellemann Award in the 'Metal' category that same year. Later in 2006, King joined the Norwegian supergroup
I as a bassist along with
Abbath of
Immortal,
Arve Isdal of
Enslaved and
Audrey Horne, and former Immortal drummer Armagedda. The band released the album
Between Two Worlds in 2006 and performed their only show at that year's
Hole in The Sky Festival in
Bergen. King temporarily quit Gorgoroth in June 2006, reportedly due to having difficulties with fronting some of the ideological aspects of the band's agenda, but later stated that the reason was dissatisfaction with Infernus' lack of contributions to the band. King also cited feeling averse to being associated with Infernus during and after the latter's trial and conviction for rape. In 2008, Gorgoroth released the video album
Black Mass Krakow 2004, while Sahg released their second studio album
Sahg II. Gaahl and King toured with Gorgoroth later that year alongside a new lineup consisting of
Teloch, Arve Isdal and
Nick Barker of
Cradle of Filth. Following a trial for the ownership of the Gorgoroth name in January 2009, the Oslo City District Court ruled in March that King's trademark application was not valid and that Infernus was the legitimate owner of the name, and that Gaahl and King had excluded themselves from the band by attempting to fire the guitarist. Following the conclusion of the dispute, King and Gaahl assumed the name
God Seed. After Gaahl's decision to retire from metal music in July 2009, King dissolved God Seed and formed
Ov Hell with
Shagrath of
Dimmu Borgir. Gaahl and King re-formed God Seed in 2012 and released the album
I Begin that same year. Following Abbath's departure from Immortal in 2015, King joined the frontman in his
eponymous band. The band released their
self-titled debut album in 2016. King left the band in 2018 over conflicting views on the lyrical concepts of their
second album. == Relationship with the metal scene and ideology ==