Nergal was raised Catholic. He started playing guitar at 8 years old. On the 8 August 2010 Nergal was sent to Gdansk Medical University Hospital because of his illness but it was only until the 24th of August that he was diagnosed with Leukemia. All Behemoth gigs until November 2010 were canceled. It seemed that chemotherapy would be ineffective but luckily a bone-marrow that matched his was found and he underwent the transplant.
He is the founder, lyricist, main composer, guitarist, frontman and manager of the black metal/death metal band Behemoth.