Spiritual Black Dimensions is the fourth studio album by Norwegian black metal band Dimmu Borgir. It was released in 1999 by Nuclear Blast Records. A deluxe edition was released in 2004 with bonus material. This release featured keyboardist Mustis and the clean vocals of ICS Vortex, as well as the departure of long-time drummer Tjodalv, guitarist Astennu, and bassist Nagash. Musically this was a departure for the group. The music's overall feel is faster and darker with more emphasis on the keyboard lines versus the slower, more riff-heavy approach of previous albums. The band attributes this to Astennu's due influence, as his Carpe Tenebrum project at the time had a very similar musical direction. This album also marked a first in Dimmu's run to feature the clean vocals of ICS Vortex, adding a new dimension to the "Dimmu sound". The band continued to use the contrasting vocals in future albums. The album cover was part of the top 10 of Greatest Heavy Metal Album Covers by Blender magazine.