Immortal is a black metal band from Bergen, Norway, 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 current 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 also do vocals as well.
Immortal arose from two short-lived bands, Old Funeral and Amputation, which were formed by Abbath and others in 1988. Immortal's original lineup consisted of ex-members from both of these bands. Old Funeral was founded by Abbath and Tore (Tore Bratseth), then went through a string of guitarists (including Demonaz, Varg Vikernes and Jørn Inge Tunsberg) until disbanding in 1992. Abbath, Demonaz, and Jørn formed Amputation, which released two demos with Demonaz on guitar and vocals, Jørn on guitars, and Padden on drums, before disbanding in 1990.
Members of Old Funeral and Amputation formed Immortal in 1991, with Abbath on bass and lead vocals, Demonaz on guitar, and Armagedda on drums. The music on their early demo recordings was death metal, with lyrics influenced by Morbid Angel and Possessed. The band then became influenced by Euronymous and bands like Bathory and Celtic Frost. They released their self-titled EP in 1991, which saw a stylistic change to black metal. This was followed by their debut album Diabolical Fullmoon Mysticism in 1992. Immortal's early full-length releases were in traditional black metal style, but their most acclaimed album, At the Heart of Winter, marks the period when the band began to experiment with a complex fusion of black metal and German thrash metal, resulting in the sound of Immortal's later works.
In 1995, the band released two video clips directed by British artist David Palser, entitled Masters of Nebulah Frost, through Osmose Productions. They featured many bizarrely-shot images of frozen landscapes and vast forests with the band performing two songs from the album Battles in the North, "Grim and Frostbitten Kingdoms" and "Blashyrkh (Mighty Ravendark)", on a Norwegian mountainside. The video for "Grim and Frostbitten Kingdoms" features Mayhem drummer, Hellhammer (Jan Axel Blomberg). These clips have become the template for many other bands producing such works, similarly to how "The Call of the Wintermoon" is also highly influential.
Apart from the two core members, Abbath and Demonaz, Immortal did not find a stable lineup until 1996, when drummer Horgh joined the band and is credited on their album, Blizzard Beasts. A major turning point for the band was in 1997 when Demonaz suffered acute tendinitis in his arm and was unable to continue playing, and Abbath took over for guitar. Despite this, Demonaz continued writing lyrics and has been a manager for the band, accompanying them on tour, releasing updates and giving interviews about how things are progressing with the band. Abbath and Horgh wrote and recorded the band's next album, At the Heart of Winter. During the tours for this album, the band recruited Iscariah to stand in for bass duties, and made him a full-time member.
Grim committed suicide in 1999; however, it is said that this was unrelated to his departure from Immortal. The band frequently headlines (as recently as 2007) a festival held in his memory, the Hole in the Sky Festival.
The next album, Damned in Black was more similar to their old style. It was well received, but is frequently overlooked as it came between two of their classic albums, At the Heart of Winter and Sons of Northern Darkness. In 2000, the EP Immortal was repackaged as part of the True Kings of Norway compilation by Spinefarm Records. Also in 2000, Immortal signed a record contract with German label Nuclear Blast; this change to a more prominent record company didn't affect their style, a fact proven by their record Sons of Northern Darkness. Two months after this, Iscariah announced his intention to leave the band and was replaced by Saroth for the next few months.
Immortal decided to split during the summer of 2003 for various personal reasons of the band members. However, in mid-October 2005, Abbath, Demonaz, and original Immortal drummer Armagedda reunited, and along with Gorgoroth bassist King ov Hell and Enslaved guitarist Ice Dale (Arve Isdal), they began work on a new project, dubbed I. This new band entered the studio at the end of April 2006 to record their debut album, Between Two Worlds, released in November 2006. Demonaz also features as lyricist for the band.
In early June 2006, German magazine Rock Hard reported that Abbath, Demonaz and Horgh had decided to resurrect Immortal and start touring again in 2007. Abbath is quoted as saying:
|"||I didn't really want to say it, but I don't give a shit. We will come back, stronger than ever. I've met with Horgh for the first time in over a year. He's built his new house here, right around the corner. In the next few days we will begin to rehearse our old 'Blizzard Beasts' classics. I'm already really hot on the idea. Immortal are timeless frost. One year more or less doesn't make a difference. We have all the time in the world.||"|
In 2007, Immortal reunited for a string of summer shows. They headlined the Inferno Festival in April, the Tuska Open Air festival in June/July, Metal Camp festival in July, and the Wacken Open Air festival in August. They also performed twice in the United States in July 2007. Filling in as bassist for these dates was Aura Noir bassist Apollyon. Immortal first toured Australia and New Zealand in March 2008.
After the reunion, Abbath and Horgh decided to reform the band on a permanent basis. This was confirmed by Demonaz in an interview with Eternal Terror. Apollyon was the permanent replacement for Iscariah, and the three began working with Demonaz on material for their next album All Shall Fall. All Shall Fall was recorded in April-May 2009, and was released on September 25, 2009.
Abbath and Demonaz were interviewed in the 2009 American documentary by Aaron Aites and Audrey Ewell, Until The Light Takes Us.
The members of Immortal were involved in a legal battle with each other over the rights to the Immortal trademark. They were also due to submit a new album to the Nuclear Blast label, though little information regarding the album and its release had been disclosed. It is confirmed, however, by Abbath that the album had been completed with the aid of various musicians.
In March 2015, Abbath left Immortal as a result of this conflict and an inability to move forward. Abbath is to continue as a musician with a solo band under his name.
On January 8, 2018, the band posted Via Facebook an update on Immortal's upcoming 9th Full-length, stating "We have put a massive amount of energy into this, and wanted to deliver our absolutely best. It has been a pleasure to finish the studio process and most of all being stoked about the final result. Peter Tägtgren has done an outstanding job in producing and mixing it. We now look forward to have it released, and are excited to share our 9th full length with you all." the release date of the album is scheduled for sometime in 2018, releasing under Nuclear Blast Records. The album will feature Original member Demonaz on Vocals, and for the first time in 20 years; Guitar. Demonaz has been the main contributor for the bands lyricism since an injury he had suffered, prevented him from continuing to play guitar for the band since 1998. The last album which had featured Demonaz on Guitar was 1997 album Blizzard Beasts. This will be the first Immortal album to not feature Abbath in the lineup.
On April 18, 2018, the tracklisting and title of the new album was revealed to be Northern Chaos Gods and was given a release date of July 6, 2018. 
Immortal's lyrics are based on an overall theme, a realm called "Blashyrkh", which is said to be "demon-and-battle-filled". The idea for Blashyrkh came about from Demonaz and Abbath's feelings of isolation living in Bergen. They created Blashyrkh to mirror those feelings, basing it on Norway, including "winter landscapes", "the woods, the mountains, the darkness, the fog", and "glacial valleys". When writing lyrics, the band Immortal's lyricist Demonaz often takes long walks in the Norwegian countryside near his hometown of Bergen for inspiration. Unlike many early black metal bands, Immortal does not have satanic-themed lyrics. However, on the band's first album, there were a few satanic references but without any lyrics attacking religion.
Immortal is much more than just a band, and much more then [sic] just a form of music. The departure of one member cannot change that. We will continue what we believe in.