Cil-Aujas was one of the High Mansions of the Nonmen, located beneath the mountain Aenaratiol. It was conquered by Cû’jara-Cinmoi after the fall of the Incû-Holoinas but before the first battles of the Cûno-Inchoroi Wars. After the Battle of Pir Pahal, emboldened by Siöl’s distraction, Nihrimsul and Cil-Aujas had revolted. But after years of hard campaigning, Cû’jara-Cinmoi finally brought the Ishroi of Cil-Aujas to heel.
King Gin’yursis of Cil-Aujas allied with Men during the Apocalypse, and he and the Meöri hero Nostol held back the Horde of the No-God at the Battle of Kathol Pass in the autumn of 2151. However, due to their envy and hate of the Nonmen, Nostol and his warriors betrayed and killed Gin’yursis and his kin the following spring.
After the passage of two thousand years, Cil-Aujas became known as the Black Halls. It was suspected that Sranc used its corridors to travel under the mountains during winter; though many mercenaries went to the hall seeking to hunt Sranc for the bounty on their pelts, none returned, and rumours began spreading that a Wracu had taken residence within it. Drusas Achamian and the Skin Eaters discovered that there was not actually any Wracu; but that in addition to hordes of Sranc and Bashrags, the ancient depradations of the Nonmen had turned the Mansion into a topos.