Immortal is a Norwegian black metal band from Bergen. The group was founded in 1991 by frontman and guitarist Abbath Doom Occulta (Olve Eikemo) and guitarist Demonaz Doom Occulta (Harald Nævdal). The pair worked with various drummers (including Grim, Armagedda and Hellhammer), and were later joined by former drummer Horgh (Reidar Horghagen) in 1996.

In March 2015, long-serving member Abbath announced his departure from the group following a dispute with the other members of the band, and he went on to form a new band under his name called Abbath. It was initially reported that following Abbath's departure, the band would split up. However, In August 2015, Demonaz and Horgh said that the band would continue without Abbath. Demonaz would return to playing guitar with the band for the first time since 1997, and would do vocals as well. Northern Chaos Gods was officially released on 6 July 2018 under Nuclear Blast Records. Although the band has been a trio for most of its history, several albums have been recorded as a duo, with varying combinations of Abbath, Demonaz, and Horgh.