Carl-Michael Eide (born 24 July 1974), also known under the stage names Aggressor, Czral and Exhurtum, is a Norwegian black metal multi-instrumentalist, vocalist and songwriter best known for his work with metal bands Ved Buens Ende, Aura Noir and Virus.

Eide has played in various black metal and avant-garde metal bands, including Cadaver, Dødheimsgard, Satyricon, Ulver and Infernö, and has been a session drummer for Dimmu Borgir.

[1][2][3] Eide's drumming style consists of very little repetition and a tendency to shy away from traditional drumming.

In addition to the usual harsh vocals of black metal, Eide uses a form of croon in the avant-garde metal bands Ved Buens Ende and Virus.

He lost the use of his feet due to a falling accident in 2005, where he fell from a four-story building and spent several months in hospital, and has not been able to play drums since, but is still active as a vocalist, guitarist and bassist.