Question: The Invaluable Darkness is a live DVD by symphonic black metal band Dimmu Borgir, a Norwegian symphonic black metal band from Oslo, Norway, formed in which year?

Context paragraphs:
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.

Chrome Division: Chrome Division is a hard rock band from Norway formed in 2004 by Shagrath, the lead vocalist of symphonic black metal band Dimmu Borgir.  It is now considered a full band of Shagrath and the current lineup consists of him on rhythm guitar, along with Shady Blue as the vocalist, Mr Damage on lead guitar, and Tony White on drums.  The band plays Doomsday hardrock and has, to date, released four albums, "Doomsday Rock 'n Roll" in 2006, "Booze, Broads and Beelzebub" in 2008, "3rd Round Knockout" in 2011 and "Infernal Rock Eternal" in 2014.

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.

Death Cult Armageddon: Death Cult Armageddon is the sixth studio album by Norwegian symphonic black metal band Dimmu Borgir, released on 9 September 2003.  It has since sold over 100,000 copies in the United States; the first album under Nuclear Blast to do so; and debuted on the "Billboard" 200 chart at number 169.  The song "Progenies of the Great Apocalypse" is released as single with accompanying music video.  Parts of the album were recorded with the Prague Philharmonic Orchestra.  This would also be the last album to have Nicholas Barker on drums.  It also features guest vocals by Abbath Doom Occulta.

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.

The Invaluable Darkness: The Invaluable Darkness is a live DVD by symphonic black metal band Dimmu Borgir.  It was released on October 14, 2008.  It is also the eighth song, not counting bonus tracks, on "In Sorte Diaboli", their eighth studio album.

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."

Progenies of the Great Apocalypse: "Progenies of the Great Apocalypse" is a 2003 song by the Norwegian symphonic black metal band Dimmu Borgir.  It served as their debut single on the album "Death Cult Armageddon".  The song features guest vocals by Immortal frontman Abbath, and features the Prague Philharmonic Orchestra - the album's Japanese edition also features a version with the orchestra only.

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.

In Sorte Diaboli: In Sorte Diaboli (Latin for "In league with the devil") is the eighth studio album by Norwegian symphonic black metal band Dimmu Borgir, released in 2007.  It is the band's first concept album.  A site on the Nuclear Blast website was created for "In Sorte Diaboli", in which a new promotional photo can be seen and an audio sample can be heard.  This would be the last album by Dimmu Borgir to feature ICS Vortex, Hellhammer and Mustis.

Supporting paragraphs: The Invaluable Darkness Dimmu Borgir
Answer: 1993