Abbath left Bömbers in late 2000 to focus on Immortal and returned after their break-up in 2003. Nicola "Morrigan" Trier (of Aeternus) filled in on bass in his abscense while Bratseth handled vocal duties.
In late 2000, Abbath shifted his focus from Bömbers to Immortal and later rejoined in 2003 after the band's dissolution. During this period, Nicola "Morrigan" Trier (from Aeternus) played bass while Bratseth managed vocals.