Initially, Deathspell Omega produced raw, traditional black metal akin to
Darkthrone's
Transilvanian Hunger. However, their 2004 release,
Si monvmentvm reqvires, circvmspice, marked a change to a more technical, experimental, and well-recorded sound with musical influences including
Russian Orthodox chanting and
choral music. The band's work after
Si monvmentvm reqvires, circvmspice was more experimental and technical, with their output in 2005—
Kénôse, "Mass Grave Aesthetics" and "Diabolus absconditus"—totaling nearly eighty minutes in length, longer than
Si monvmentvm reqvires, circvmspice. The second volume of the band's trilogy,
Fas – Ite, Maledicti, in Ignem Aeternum, was released on 16 July 2007, outside the United States, and the following day within the United States. The band released another EP in January 2009, entitled
Veritas Diaboli Manet in Aeternum: Chaining the Katechon. The final album in the trilogy,
Paracletus, was released by Norma Evangelium Diaboli and
Season of Mist on 9 November 2010. The band's final work related to the trilogy, an EP titled
Drought, was released on 22 June 2012. Deathspell Omega's sixth full-length album,
The Synarchy of Molten Bones, was made available early to download and stream on 31 October 2016 with a full physical release on 8 November. The band's seventh full-length album,
The Furnaces of Palingenesia, was released on 24 May 2019. It is presented as a manifesto from a
dictator speaking for a political faction referred to as "the Order"; it is explicitly intended to deconstruct
authoritarian regimes of both the left and the right. The band recorded the album live in a studio using analogue gear, and it was mastered more quietly than most of the band's preceding material, also reflecting a shift in production approach. Without naming any of their members directly, the band also claimed there was an ideological rift within the band, noting: "A minority of the collective's contributors – shall we say, parts of the second circle – who've been invited to partake because of their incredible talents as musicians are involved with earthly politics, but stand on completely opposite ends of the political spectrum and are therefore irreconcilable political foes. Were it not for dialogue on the grounds of transgressive art, they'd be shooting each other. That tension is what interests us." They also state that the music and lyrics were authored by the "French core of the collective". This clarification was made in the wake of backlash against Deathspell Omega due to their longtime collaboration with Finnish musician Mikko Aspa, who has released
National Socialist black metal music under the solo project
Clandestine Blaze and has ties to
RAC acts. == Band members ==