In 2004, they were the first band to be signed to Tyrant Syndicate Productions, a sub-label of Peaceville Records, run by Nocturno Culto and Fenriz (both of Darkthrone). They released their next album ‘The Merciless’, which featured Nattefrost of Carpathian Forest and Fenriz on guest vocals.
The band was put on hold after Aggressor was in a severe accident in late March, 2005. Despite this setback, the band continued to record new material, which resulted in a new full-length album, ‘Hades Rise’, being released on August 25, 2008. In the interim, the rest of the band had played several live gigs with a replacement drummer. However, by 2011 Aggressor has rejoined the band for live shows once again, after being out of the live line-up for several years.