Muzan, along with the other Hadou gods is ressurected by Naraka for a mysterious purpose. 'A world where strength is everything, sinful people poisoned by cruelty and shamelessness, and if shame does not exist, neither does regret.'EXCERPT FROM DIES IRAE PANTHEON SITE TRANSLATED 'Therefore, with the desires growing to the extremes, not being shackled by anything, the era where atrocious crime equal to the progression of civilization had begun.' 'The second generation God' who overthrew Shinga and took the Throne, his Law planted the original sin in every living being, creating the world of primordial karma.' As described in the Mausoleum of Gods, he is the Second Generation who overthrew First Heaven and replaced with the law where the beast of original sin implanted in every beings upon their birth, a world where evil consumes evil and civilization reached its peak. Muzan made a token appearance as one of the former Hadou Gods in the Throne Archive along with Nigenron, Hisouten, Eigo Kaiki, Rinne Tensei and Tengu Dou.

At the end of the game Nerose Satanel usurps the throne from him.

While he does not appear in the game, he is the one who created the world of Paradise Lost. On the eve of Christmas in Germany during the year 1939, Reinhard, then chief of the Gestapo of the time, was in charge of handling a suspect by the name of 'Karl Kraft' after the latter had predicted the attempted assassination of the Fuhrer sometime ago in the same year. Muzan (無慙, Muzan), also known by his true name, Magsarion, is the second god to sit on the throne and the creator of the world of Paradise Lost. Reinhard Heydrich is one of the main antagonists of the Dies Irae visual novel series.

Dies irae visual novel wiki