Abbath

Although he is primarily a guitarist, he is also proficient as a bassist and a drummer, having recorded all drums for Immortal albums Pure Holocaust and Battles in the North. Following his departure from Immortal in 2015, he announced that he would be forming a new band under the Abbath name.

After Abbath split with Immortal in 2015, he formed another band, Abbath, taking advantage of his already popular name in the black metal music industry. The band released their first album in early 2016, and played live for the first time at Tuska Open Air 2015.

As of 2015, Abbath is an endorsee of Schecter Guitars. A signature model was released, called the RavenDark V, in 2017.

They began to tour again, recently playing shows at Wacken Open Air in Germany, and touring for the first time in Australia and New Zealand in March 2008. The newest Immortal album All Shall Fall was released in September 2009 in Europe with a US release following a month later.

In early June 2006, it was announced through the German Rock Hard magazine that Abbath and Horgh would reunite as Immortal. They began practicing old material. In regard to when Immortal would start playing live again, Abbath said:

In 2006, Abbath started a new band called simply "I". Abbath is the frontman and guitarist of I and is joined by former Immortal drummer Armagedda on drums, Gorgoroth bassist King ov Hell on bass, Enslaved guitarist Arve Isdal on guitars, and former Immortal guitarist Demonaz writing lyrics. The debut album called Between Two Worlds was released in 2006.

Bömbers is a Motörhead tribute band formed in 1996. The band consists of Abbath on lead vocals and bass, Tore (ex-Old Funeral) on guitars, and Pez (Punishment Park) on drums. During the Inferno Metal Festival 2007, Abbath joined the German thrash metal band Sodom on stage and performed a cover of Motörhead's "Ace of Spades".

Immortal's history began in 1989 as death metal band Amputation. At various times throughout Immortal's existence, Abbath was lead vocalist, bassist, guitarist, keyboardist, drummer, and lyricist, mainly due to the inconsistent line-ups they were able to put together. For a long time, however, Abbath served the band as vocalist, bassist and (studio) drummer while Demonaz played lead guitar. It was not until Horgh arrived that Immortal was able to secure a steady line-up, but problems continued. After the release of Blizzard Beasts in 1997, Demonaz was diagnosed with acute tendinitis, and was consequently forced to quit as guitarist, but remained as lyricist and band manager. They released At the Heart of Winter in 1999, this time with Abbath handling guitar and bass, with Horgh still on drums. This album marks a large shift in sound and style for the music of Immortal. In 2000 they released Damned in Black, with Iscariah on bass. Sons of Northern Darkness was released in 2002, with the same lineup.

Olve Eikemo (born 27 June 1973), better known by his stage name Abbath Doom Occulta or simply Abbath, is a Norwegian musician best known as a founding member of the black metal band Immortal. Before founding Immortal, Abbath performed with Old Funeral alongside future Immortal member Demonaz. While working with Old Funeral, he also joined Demonaz's band Amputation which later became Immortal. He also plays bass in Demonaz's eponymous project.