Attila Csihar, born in Budapest, also sometimes known as Void, is a Hungarian extreme metal vocalist, best known for his vocal work in Norwegian black metal band Mayhem and American drone-doom project Sunn O))). His music career began in 1985 in the Hungarian metal band Tormentor, which reached cult status in black metal circles with their first album, Anno Domini (1988). Tormentor performed 50-100 live shows between 1986-90 and become one of the most infamous band in Hungary of all times. After Tormentor he started his dark electro industrial band Plasma Pool (1990-1994). On the strength of his work in Tormentor, he was invited to perform vocals on the De Mysteriis Dom Sathanas album of Mayhem.