Fiction:The Firmament/Necrodark

The Necrodark is the realm of the corpse-god Keer'graz in the Underworld, and is considered the greatest nexus of undeath in the Firmament.

Description
The Necrodark is an immense city shrouded by darkness, inhabited by all sorts of undead, who praise the Lich King in their eternal unlife while battling constant invasions from psychopomps seeking to destroy it. While once beyond their presence, the spread of undeath across the Firmament caused the Necrodark to grow into a fortified realm powerful enough that not even Dominus Mortis has the power to remove anymore.

Inhabitants
Inhabiting the Necrodark is arguably the greatest goal in the existence of the undead, for it is here where they all begun. The city is inhabited by all manners of walking dead, from lowly zombies to mighty lich lords, who are all subservient to the Dead Father and aid in the propagation of their 'gift' across the cosmos.