Tore Gunnar Stjerna (a.k.a. Necromorbus) is a Swedish multi-instrumentalist and producer. He has played guitar and drums in the following bands; Nex, Watain, Chaos Omen, Corpus Christii, Funeral Mist, Ofermod, Zavorash, Desolation, In Aeternum. He also founded Necromorbus Studio (NBS Studio) in Sweden. While running the studio, he has produced and mastered albums for bands such as Armagedda, Bitter Peace, Destroyer 666, Inferno, Jess and the Ancient Ones, Leviathan, Mayhem, Merrimack, Noctem, Nominon, and Portrait.