King joined the Bergen-based black metal band Gorgoroth as a bassist in 1999, shortly before the recording of their fifth album Incipit Satan.

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.

King further collaborated with Einar Selvik that same year in the black metal band Jotunspor and on their album Gleipnirs Smeder.

The reasons given for the duo's actions were claims of Infernus having no interest in promoting Gorgoroth or participating creatively and the guitarist's abusive and disrespectful behaviour towards promoters, session members and other working partners, along with Gaahl and King's claim of having "creatively defined" the band through the past eight years.

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.

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.

[16][17] According to Gaahl, he and King are friends with the late Martin Eric Ain and Thomas Gabriel Fischer of Celtic Frost.

Gorgoroth guitarist Tormentor departed the band in 2002 due to falling out with King and testified for Infernus at the trademark rights trial.