A Sorcery Written in Blood was the first demo released by Norwegianblack metal band Gorgoroth. The title of the demo was taken from the lyrics of the song "The Return of Darkness and Evil" by the band Bathory. The demo was released in 1993 as a limited edition hand-numbered cassette. A 7" vinyl bootleg also exists; however, there are no official re-issues. Due to the Satanic imagery used on the demo cover, the newspaper Firda in Førde in Sogn og Fjordane, Norway, ran a front-page story on the demo and Gorgoroth on 7 January 1994. The demo led to the band landing a record deal with French record label Embassy Productions. The track "Sexual Bloodgargling" is an early version of the song "Ritual", re-recorded for Gorgoroth's first album Pentagram.