During 1991, Darkthrone adopted the aesthetic style that would come to represent the black metal scene, wearing corpse paint and working under pseudonyms. Gylve Nagell became "Fenriz", Ted Skjellum became "Nocturno Culto" and Ivar Enger became "Zephyrous". In August 1991, they recorded their second album, which was released at the beginning of 1992 and titled "A Blaze in the Northern Sky". The album contained Darkthrone's first black metal recordings, and Peaceville Records was originally skeptical about releasing it due to Darkthrone's extreme diversion from their original death metal style. After the album was recorded, bassist Dag Nilsen left the band, as he didn't want to play black metal, and is merely credited as "session bass" with no picture on the album. The band's third album, "Under a Funeral Moon", was recorded in the summer of 1992 and released in early 1993. It marked Darkthrone's total conversion to the black metal style, and is considered a landmark for the development of the genre as a whole. This album also marked the last album on which guitarist Zephyrous would perform. It was followed by their fourth album, "Transilvanian Hunger", which was released in February 1994. This was Darkthrone's first album to have just two members, Nocturno Culto and Fenriz. Fenriz is credited with all instrumentation and songwriting, while Nocturno Culto only contributed vocals. The band would remain a duo from this point onwards. "Transilvanian Hunger" was characterized by a very "raw" or "low fidelity" recording style and monotone riffing with little melody. The album's release caused some controversy: half of its lyrics were written by the Norwegian black metal musician Varg Vikernes, and its booklet contained the phrase "Norsk Arisk Black Metal", which translates into English as "Norwegian Aryan Black Metal". Darkthrone moved to another independent record label, Moonfog Productions, for subsequent releases. The label was run by Satyr of Satyricon. Their fifth album, "Panzerfaust", was released in 1995. Its production is similar to that of "Transilvanian Hunger", and Fenriz is similarly credited with all instrumentation and songwriting, while Nocturno Culto only contributed vocals. Lyrics for the track "Quintessence" were written by Varg Vikernes.