Abruptum was formed in 1989 by IT and All. IT had planned to create the band as early as 1987. After the release of the first demo they kicked out Ext. They released a 7″ EP after which All was forced to leave the band because of his growing drinking problem. IT then found a new member in Evil from the young band Marduk. The band became famous thanks to the fact that IT was one of the leaders within The Satanic Black Circle.