Question: Fenriz was one half of the Norwegian heavy metal band that formed in 1986 under what name?

Context paragraphs:
Circle the Wagons: Circle the Wagons is the 14th album by the Norwegian band Darkthrone.  The album was released on 5 April 2010.  Fenriz, the band's drummer, described the music as Darkthrone's "own brand of heavy metal/speed metal-punk" and declared it a further shift from their old black metal style.  About half of the album was written by Fenriz and half by Nocturno Culto.

Absolute Steel: Absolute Steel is a Norwegian heavy metal band from Larvik.  Formed in 1999, the band’s founding members were Andy Boss (lead guitar), Dave Bomb (lead guitar) and K2 (vocals).  Throughout the late 1990s they played live performances and developed a heavy metal party band style that caught the attention of Edgerunner Records, a local heavy metal label.  In 2002, the label released "The Fair Bitch Project", the band's debut recording.  Performances after the release further defined their style by featuring female strippers and pyrotechnics.

Hein Frode Hansen: Hein Frode Hansen (born 25 March 1972 in Haugesund) is a Norwegian heavy metal drummer.  He was the original vocalist of the power metal band Serpent, formed in 1989.  In 1990 he started playing drums in the death metal band Phobia.  Both bands broke up in 1991.  From 1993-2010 he played in Theatre of Tragedy, and with them released seven studio albums, two live albums and several studio EP's.  Hansen has started a new project with Kristian Sigland, called The Black Locust Project.

Booze, Broads and Beelzebub: Booze, Broads and Beelzebub is the second studio album by Norwegian heavy metal band Chrome Division.  It was released on July 18, 2008 through Nuclear Blast.  The band announced that they had finished recording the album on January 15, 2008 on their MySpace blog, and announced the title and the planned release date on May 14, 2008, which was picked up on by heavy metal news sources.  The album took seven days to record at Studio Fredmann in Gothenburg, starting on January 7, 2008.  Before either of the blog announcements, bassist Björn Luna said in an interview that Chrome Division's next album would be released on Nuclear Blast, explaining that the band have a three album contract with the label, and Blabbermouth.net confirmed that the album would be released on Nuclear Blast.

Delusions of Grandeur (Sahg album): Delusions of Grandeur is the fourth studio album by the Norwegian heavy metal band Sahg, released on October 25, 2013, under the Norwegian record label Indie Recordings.  It's the first concept album of the band, with the delusions of grandeur theme or megalomania.

Jan Axel Blomberg: Jan Axel "Hellhammer" Blomberg (born 2 August 1969) is a Norwegian heavy metal drummer.  He is best known as the drummer of Mayhem, which he joined in 1988.  In 1987 Blomberg formed the avant-garde black metal band Arcturus (under the name Mortem) with Steinar Sverd Johnsen, which broke up in April 2007 and reunited in 2011.  He named himself after the Swiss extreme metal band Hellhammer.  Praised as a talented musician, Blomberg is a three-time winner of the Spellemannprisen award.

Darkthrone: Darkthrone is a Norwegian heavy metal band.  It formed in 1986 as a death metal band under the name Black Death.  In 1991, the band embraced a black metal style influenced by Bathory and Celtic Frost and became one of the leading bands in the Norwegian black metal scene.  Their first three black metal albums—"A Blaze in the Northern Sky", "Under a Funeral Moon" and "Transilvanian Hunger" (sometimes dubbed the "Unholy Trinity") — are considered the peak of the band's career and to be among the most influential albums in the genre.  For most of this time, Darkthrone has been a duo of Nocturno Culto and Fenriz, who have sought to remain outside the music mainstream.  Since 2006, their work has strayed from the traditional black metal style and incorporated more elements of traditional heavy metal, speed metal and punk rock, being likened to Motörhead.

Triosphere: Triosphere is a Norwegian heavy metal band from Trondheim, Norway, created in 2004 by singer and bassist Ida Haukland, and guitarist Marius Silver Bergesen.  They are defined by their heavy metal sound emphasising their power metal-like melodies and choruses, while also featuring progressive elements.  Bergesen is the composer of all instrumental parts, with Haukland acting as lyricist, and composer of the vocal parts.

Kvelertak: Kvelertak is a Norwegian heavy metal band from Stavanger, formed in 2007.  The group comprises vocalist Erlend Hjelvik, guitarists Vidar Landa, Bjarte Lund Rolland and Maciek Ofstad, bassist Marvin Nygaard and drummer Kjetil Gjermundrød.  Kvelertak have Norwegian lyrics and their main influences are rock and roll, black metal and punk rock.

Fenriz: Gylve Fenris Nagell (born 28 November 1971), better known as Fenriz, is a Norwegian musician and politician who is best known as being one half of the metal duo Darkthrone.  Although primarily a drummer, he has also performed bass, guitar and vocals for Darkthrone and a number of other metal bands.  Fenriz is known for his refusal to play live, his obsessiveness about music listening, supporting other underground bands and his lack of interest in the mainstream music business in general.  Fenriz has had three solo projects: the folk metal project Isengard, the dark ambient project Neptune Towers and the doom metal project Red Planet.

Supporting paragraphs: Fenriz Darkthrone
Answer: Black Death