Hellhammer，Jan Axel "Hellhammer" Blomberg (born 2 August 1969) is a Norwegian heavy metal drummer. He is best known as the drummer of Mayhem, which he joined in 1988. In 1987 Blomberg formed the avant-garde black metal band Arcturus (under the name Mortem) with Steinar Sverd Johnsen, which broke up in April 2007 and reunited in 2011. He named himself after the Swiss extreme metal band Hellhammer. Praised as a talented musician, Blomberg is a three-time winner of the Spellemannprisen award