De Mysteriis Dom Sathanas is the fourth official release and second studio album by the Norwegian black metal band Mayhem. Songwriting began as early as 1990, but due to the suicide of vocalist Dead and murder of guitarist Euronymous, the album's release was delayed until May 1994.
During the recording, tensions arose between Vikernes and Euronymous. On 10 August 1993, Vikernes and Ruch travelled to Euronymous's home in Oslo. Upon their arrival a confrontation began, which ended when Vikernes fatally stabbed Euronymous. His body was found outside the apartment with twenty-three cut wounds – two to the head, five to the neck, and sixteen to the back. Vikernes defends that most of Euronymous's cut wounds were caused by broken glass he had fallen on during the struggle. He was arrested within days and sentenced to 21 years in prison for both the murder and the church burnings.
After Vikernes was convicted for the murder, Euronymous' parents requested that the album not feature the bass parts recorded by Vikernes. Hellhammer allegedly agreed to remove the bass parts and re-record them himself. However, instead of re-recording the bass parts, he simply lowered Vikernes' contributions in the final mix of the album.
The final product, De Mysteriis Dom Sathanas, features the last lyrics written by Dead before his suicide, and the last songs recorded by Euronymous before his murder. It may also be the only heavy metal album on which both a murderer and his victim perform.
While Mayhem's previous vocalist had been Swede, Attila Csihar was from Hungary. His style is somewhat atypical for black metal, and has provoked a mixed reception from fans; for example, Metal Reviews gave him the nickname "Attila 'Fingernails' Csihar" (although a subsequent review by the website praised his later, Ordo Ad Chao-era performances).