Simen Hestnæs (born 4 March 1974), better known by his stage name ICS 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 heavy metal band Borknagar, and the former bass guitarist and backing vocalist for the symphonic black metal band Dimmu Borgir. Biography His longest-running band is the doom metal band Lamented Souls, which began in 1991 and for which he plays guitar and handles the vocal duties. He actually started out as their drummer, but switched places with Ole Jørgen Moe when they became aware of his singing abilities. His moniker was a bit of a joke to poke fun at one of Garm's aliases, Fiery G. Maelstrom: "Icy S. Vortex", with the first words being opposite elements, the middle initial being the first letters of their common names, and the last word being a powerful circular current of water. In 1995, he was on tour with the avant-garde metal band Ved Buens Ende and performed the supporting vocals. Songs from that tour were later released on ...Coiled in Obscurity bootleg album. In 1997, Hestnæs made a guest appearance on the Arcturus album La Masquerade Infernale. He sang on three songs: "Master of Disguise", "The Chaos Path" (in which he handled all lead vocals, wrote the lyrics and co-composed this song), and "Painting My Horror". In 1997, the folk/progressive/black metal band Borknagar was in need of a vocalist after the departure of original vocalist Garm. Garm introduced the band to Hestnæs, who became their vocalist from 1997 to 2000. He took over bass duties as well, recording bass for their fourth full-length Quintessence, after bass guitarist Kai K. Lie left the band. In August 2000, Hestnæs left Borknagar to fully concentrate on Dimmu Borgir. According to an interview, Borknagar was set to tour Europe with Mayhem, about the same time he would be in the studio to record with Dimmu Borgir. Borknagar guitarist and frontman Øystein G. Brun gave Hestnæs an ultimatum: tour with Borknagar, or quit and deal with Dimmu Borgir. He opted for the latter, stating that he thought Dimmu Borgir would become a more successful band in the long term. Brun would later state that the decision was "business", and that he "had nothing