In 2002, Benny Hägglund, long time friend of Hedlund, and live drummer for Vintersorg, began working on music for a project that would combine melody and aggression into energetic songs. He eventually felt compelled to ask Hedlund for support in this project, thus Fission was born. With Benny playing drums, guitar, and bass, and Hedlund singing and adding his experimental edge to their melodic thrash metal with his unique synths, the band recorded their first full-length, entitled "Crater", released in 2004 through Napalm Records.