Question: Which Norwegian black metal band invited Attila Csihar from Tormentor to do vocals on their first full-length studio album?
Context: Fire Walk with Us!  is the second studio album by the industrial black metal band Aborym.  This is Aborym's first album to feature Mayhem vocalist Attila Csihar as a full-time member.  "Fire Walk with Us!"  contains a cover of Burzum's Norwegian: "“Det som en gang var”" , in which bassist Malfeitor Fabban performs vocals. Tormentor is a black metal band formed in 1986 in Budapest, Hungary.  They recorded their first album, "Anno Domini", in 1988, but were unable to release it until the end of communism.  The album reached Norway through the tape-trading community.  Following the suicide of Per Ohlin, Mayhem invited Attila Csihar from Tormentor to join the band; he was to perform the vocals on "De Mysteriis Dom Sathanas".  Tormentor split up in 1991.  After a long break they reformed and released the more experimental "Recipe Ferrum" through Avantgarde Music in 2001. Generator is the fourth studio album by the Italian industrial black metal band Aborym.  Former vocalist Attila Csihar makes a guest appearance on this album, performing vocals on "Man Bites God".  Vocals on the rest of the album are performed by Prime Evil. Strid is a Norwegian black metal band that was originally known as "Malfeitor" from 1991 to 1992.  After releasing two demos - "Malfeitor" (in 1991) and "Pandemonium" (in 1992), they changed their name to "Battle" and there were some line up changes at the time.  In the year of 1992 the band released the "End of Life" demo.  The demo contains only one song which is around 11 minutes.  The line up at the time of recording the demo was: Storm - on bass and vocals, Lars Fredrik Bergstrøm - on guitars and Jardar - on drums.  The guitars were written by Lars Fredrik Bergstrøm (1974 - 2014).  In 1993 the band changed the name to "Strid" which means "Battle" in Norwegian.  That same year, Strid re-released their "End of Life" demo under their new name, through the German label "Malicious Records".  After releasing the "End of life" demo, Lars Fredrik Bergstrøm left the band and was replaced by Ravn Harjar.  Through the years between 1993 and 1995, the band writes and records the self-titled EP which was released through Malicious Records and contains only two songs - "Det hviskes blant sorte vinder" which means "It Is Whispered Amid the Black Winds" in Norwegian and "Nattevandring" which means "Nightwandering" in Norwegian.  The music style and sound of this demo is more ambient/atmospheric black metal oriented.  Mainly because of this release, the band is commonly recognised as the creators of depressive black metal along with some other bands from the second wave of black metal music.  At this time the band line up contains: Ravn Harjar - on guitars, Storm - on bass and vocals and Jardar - on drums.  After the releasing of the self-titled EP, there was no any official releases by the band.  There are also bootleg releases that came out through the years like the CD from 2005 by Ars Mysteriorum and LP, each featuring both "End of Life" and the self - titled EP tracks.  In the year of 2001 the original former member of "Malfeitor/Battle/Strid", bass player and vocalist - Storm committed suicide.  In the year of 2007, the Greek label Kyrck Productions & Armour re-released all the previous material released by the band from the past which contains all "Malfeitor/Battle/Strid" material.  Somewhere between 2009 and 2010 there was a reunion of the band with old members including Vicotnik (Dødheimsgard, ex-Aphrodisiac, ex-Ved Buens Ende, ex-Manes, ex-Code, ex-Naer Mataron, ex-Endwarfment).  Another member that was part of the reunion was Lars Fredrik Bergstrøm - the main composer of the "End of Life" track.  In 2014 Lars Fredrik Bergstrøm died.  At this time the band line up contains Ravn Harjar - on guitars and vocals, Vicotnik - on bass and Sigmund (ex-Inflabitan, ex-Dødheimsgard) - on guitars.  In January 2015, Ravn Harjar wrote a statement on the official Strid Facebook page that in the autumn of the year 2015 the band will start recording their first full-length album which will be titled "Endetid".  That means "End of times" in Norwegian. De Mysteriis Dom Sathanas is the first full-length studio album by the Norwegian black metal band Mayhem.  Songwriting began in 1987, but due to the suicide of vocalist Per "Dead" Ohlin and the murder of guitarist Øystein "Euronymous" Aarseth, the album's release was delayed until May 1994.  "De Mysteriis Dom Sathanas" is widely considered one of the most influential black metal albums of all time. Demo 2002 was the first release by the Norwegian black metal band Orcustus, founded by Taipan and with Infernus and Tormentor of Gorgoroth and Dirge Rep of Enslaved and Gehenna.  It was limited to 1,000 copies on CD.  This demo was deemed a significant and important release by several well-known musicians from the Norwegian black metal scene, such as Fenriz of Darkthrone and Frost of Satyricon, and led to the band being signed to the US record label Southern Lord Records. Attila Csihar (] ; born 29 March 1971), also sometimes known as Void, is a Hungarian black metal vocalist, best known for his vocal work on Mayhem's "De Mysteriis Dom Sathanas" album.  Author Ian Christe describes his vocals as "operatic." Satyricon is a Norwegian black metal band, formed in 1991 in Oslo.  Satyr and Frost have been the band's core members since 1993.  The band's first three albums typify the Norwegian black metal style.  Since its fourth album in 1999, the band has strayed from this style and included elements of traditional heavy metal in their sound.  Satyricon was the first Norwegian black metal band to join a multi-national record label (EMI). Eschaton is the third album by British black metal band Anaal Nathrakh.  Musically, the album continues in the vein of the previous album, "Domine Non Es Dignus".  Some reviewers have commented that the overall atmosphere and production are at the same time a step back towards the out-and-out ferocity of the band's debut.  The album features guest appearances by Shane Embury (Embryonymous) on bass, and Attila Csihar (from Mayhem) performs vocals on "Regression to the Mean". Incipit Satan is the fifth full-length album by Norwegian black metal band Gorgoroth.  It was released on 7 February 2000 by Nuclear Blast, and reissued in 2006 by Back on Black Records.  "Incipit Satan" was the first album with King ov Hell as bassist, the last album to feature Tormentor on guitar and the only one with Sjt.  Erichsen on drums.  The band members dedicated the album to their deceased friend and former bandmate Erik Brødreskift (a.k.a. "Grim").
Answer: Mayhem