Mausoleum, sometimes known as the Realm of the Endless, is an underground city of the dead. It has the largest population, consisting of ghosts, zombies, skeletons, ghouls, vampires, and other such undead. The living are generally not welcome in Mausoleum, viewed as prey at worst, and a nuisance at best, even though the King of the Dead's law forbids harming living visitors.
It is believed that the bottom of the city leads directly to the underworld, but none dare verify this belief.