Immora

Immora is the first city and the capital of what was once Jekkad, now Hell. It is the site of the final conflict in Doom Eternal between the Slayer and Davoth. A precise history of the city is unknown as it is described mostly in the Maykrs' texts and these were altered after the betrayal of The Father.

Codex Entry
Translations of ancient texts name Immora as the capital city of Hell Davoth, the creator of this primal realm, came to be known as the Dark Lord after the betrayal by the race of Maykrs he had crafted. Sealed off against his will from the other dimensions, the first world (known as Jekkad) fell into corruption and transformed over time into Hell.

Once a paradise at the dawn of creation, Immora now survives as a stronghold where the Dark Lord resides. Sustained now by the essence of Hell's victims, the people of Immora experience life eternal. Regular infusions of Hell energy have prevented them from transforming into the demons found outside the boundaries of the city. Ancient technology defends Immora from invaders, the high walls impenetrable to those who would bring harm to the last people of the first world.