Nattefrost

Rasmussen was born in Sandnes, Rogaland County, Norway. His first musical experience was with black metal band The Childmolesters, which he founded in 1990 alongside future Carpathian Forest bandmate Johnny "Nordavind" Krøvel. The band became Enthrone, which changed its name to Carpathian Forest in 1992. During Carpathian Forest's first years, Nattefrost used the pseudonym Lord Nosferatu. He would not be known as "Nattefrost" (Norwegian for "Night frost") until 1995, when the band released its first EP, Through Chasm, Caves and Titan Woods.

In 2000, Nattefrost formed the side project World Destroyer with Eivind Kulde and Carpathian Forest bandmate Daniel Vrangsinn. The band released the demo album Diabolical Quest, in 2004; it is their only release. He formed the duo Kreft in 2011 with Patolog Falk, releasing the EP Lommemannen that year.

In 2003, Nattefrost announced a solo project. The following year, he released his first album, Blood & Vomit. His second album, Terrorist (Nekronaut, Part I), came out the following year and featured guest appearances by numerous musicians, such as Carl-Michael Eide, Sanrabb of Gehenna and Hoest of Taake. He released the live 2006 EP Drunk and Pisseskev at Ringnes 2004, recorded during his first show, in Ringnes. A compilation of rarities, Hell Noise and Live Terrorism, came out in 2008.

Nattefrost's latest release was the 2009 split album Engangsgrill with Darkthrone's Fenriz's doom metal side project, Red Planet.

In 2016, he collaborated with Urgehal, providing vocals and lyrics for the song "Endetid", off their seventh album, Aeons in Sodom. He collaborated with Green Carnation (on Light of Day, Day of Darkness), Taake (on Hordalands doedskvad) and Aura Noir (on The Merciless).