Question: Gerlioz, is a Norwegian keyboardist for which Norwegian symphonic black metal band from Oslo, Norway, formed in 1993?

Context paragraphs:
Sodomizing the Archedangel: Sodomizing the Archedangel is an EP by the French symphonic black metal band Anorexia Nervosa.  It was self-produced, and released in 1999 via Osmose Productions.  It marks the transition from the band's previous industrial metal style to symphonic black metal, and is their first release to feature long-time vocalist Nicolas Saint-Morand (also known as R.M.S. Hreidmarr) and keyboardist Neb Xort.

Exile (Anorexia Nervosa album): Exile is the first studio album by the French symphonic black metal band Anorexia Nervosa.  It was released in 1997, through Season of Mist.  It is notable as the band's only industrial metal album, before they became a symphonic black metal band.  It is also the only album to feature Marc Zabé as one of the guitarists and Stéphane Gerbaut on vocals, as he was later replaced by R.M.S. Hreidmarr when the band decided to abandon the industrial metal.

Mustis: Mustis is the pseudonym of Øyvind Johan Mustaparta (born 10 September 1979), a Norwegian keyboardist best known for his work in the symphonic black metal band Dimmu Borgir, as well as the black/thrash metal band Susperia.  Mustis joined Dimmu Borgir in 1998 and has contributed to the further progression of their ambient, atmospherical, symphonic sound.  This can be heard in songs such as "Progenies of the Great Apocalypse," which he composed, on their 2003 album, "Death Cult Armageddon".  His other studio work with Dimmu Borgir includes "Spiritual Black Dimensions" (1999), "Puritanical Euphoric Misanthropia" (2001), and the re-release of "Stormblåst" (2005) and "In Sorte Diaboli" (2007).  Mustis departed the band in 2009 and issued a statement in which he implied that he was being kept out of the proper registration for music he was writing.  Due to this, according to his statement, he was fired by text message and he will be allowing "the resolution come from the lawyers instead of dealing with more dishonesty and lies on a one-on-one personal level."

ICS Vortex: Simen Hestnæs, also known as I.C.S. Vortex or simply Vortex, is a Norwegian musician.  He is the vocalist of the similarly named band ICS Vortex, the avant-garde metal band Arcturus, and the doom metal band Lamented Souls.  He is also the vocalist and bass guitarist to the progressive black metal band Borknagar, and the former bass guitarist and backing vocalist for the Norwegian symphonic black metal band Dimmu Borgir.

Hecate Enthroned: Hecate Enthroned is a British symphonic black/death metal band formed and based in Wrexham, Wales.  They formed in 1993 as a blackened death metal act under the name Amethyst, changing their name to Daemonum later on.  In 1995 the band changed its name to their current one and embraced a symphonic black metal style that was constantly compared to early Cradle of Filth, although since 1999 their work has strayed from their earlier symphonic black metal style and has incorporated more elements of melodic death metal.

Morgul: Morgul is a Norwegian symphonic black metal band formed in Råde, Norway in the year 1991.

Geir Bratland: Gerlioz (born July 29, 1970 in Narvik, Norway) is a Norwegian keyboardist for the band Dimmu Borgir (2010-) and formerly was a member of the bands God Seed (2008-2009, 2012-2015), Apoptygma Berzerk, The Kovenant and Satyricon.

Silenoz: Silenoz (born Sven Atle Kopperud on 1 March 1977) is a Norwegian guitarist who is a founding member, along with Shagrath and Tjodalv, of the Norwegian symphonic black metal band Dimmu Borgir which he is the primary songwriter.  He is also guitarist for the death metal supergroup, Insidious Disease.

Dimmu Borgir: Dimmu Borgir ( , ] ) is a Norwegian symphonic black metal band from Oslo, Norway, formed in 1993.  The name is derived from Dimmuborgir, a volcanic formation in Iceland, the name of which means "dark cities" or "dark castles/fortresses" in Icelandic, Faroese and Old Norse.  The band has been through numerous lineup changes over the years; guitarist Silenoz and vocalist Shagrath are the only original members who still remain with guitarist Galder being a longstanding member.

Lord Kaos: Lord Kaos was an Australian black metal band that formed in Sydney in 1994.  For several years the group was the most prominent act of its style in the country with one founding member going on to record and perform with several Norwegian black metal bands including Dimmu Borgir.  While Lord Kaos only released one album, the group was a considerable influence on the local heavy metal music scene as not only arguably the first but one of the few bands to record and perform Norwegian-style symphonic black metal.

Supporting paragraphs: Geir Bratland Dimmu Borgir
Answer: Dimmu Borgir