 In 2011, they released the album "Heritage of Satan", featuring Aura Noir and Ava Inferi guitarist Rune "Blasphemer" Eriksen, Behemoth vocalist Adam "Nergal" Darski and Watain vocalist Erik Danielsson, who also created the album cover, as guest musicians.Although Big Boss is the only remaining founding member, the band's core now consists of him, bass player Golem and guitarist Ashok.On 28 September 2016 the band announced that they begun work on their tenth studio album, "Kärgeräs – Return from Oblivion", the sequel to their 1996 concept album "Kärgeräs".