Fission is a Swedish melodic death metal band formed in 2002. The band began as Benny Hägglund's personal project, with the hopes of fusing melody and aggression into his music. After writing some material, he decided to seek aid from Andreas Hedlund of Vintersorg, the band in which Hägglund plays live session drums. After recording a two-track demo with Benny handling all instrumentation and Andreas handling vocal duties, they signed on with Austrian label, Napalm Records. Benny continued writing all of the songs for their first full-length, while Andreas provided all of the lyrics, vocals, keyboards, and sound effects. They released their first full-length Crater on April 27, 2004.