Stian Johansen is a Norwegian

Norway

Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

 musician known under the stage name Occultus and "Cultoculus". He was briefly a vocalist and a bassist

Bassist

A bass player, or bassist is a musician who plays a bass instrument such as a double bass, bass guitar, keyboard bass or a low brass instrument such as a tuba or sousaphone. Different musical genres tend to be associated with one or more of these instruments...

 for the black metal

Black metal

Black metal is an extreme subgenre of heavy metal music. Common traits include fast tempos, shrieked vocals, highly distorted guitars played with tremolo picking, blast beat drumming, raw recording, and unconventional song structure....

 band Mayhem

Mayhem (band)

Mayhem is a Norwegian black metal band formed in 1984 in Oslo, Norway and regarded as one of the pioneers of the influential Norwegian black metal scene...

. Occultus was in the band for a very short time in 1991 after the suicide of Dead (Per Yngve Ohlin).

He was also in many other bands: Con Anima, Shadow Dancers, Thy Abhorrent, Einar Grimm Group, Pussycunts, Perdition Hearse, Soul Transition.