Vicious, chaotic and seemingly inexhaustible, the Demonruck was a horde of gnolls, demons and the undead that overwhelmed and brought to ruination each of the Five Cities in the name of the demon prince Yeenoghu. First mentioned as “the cynocephali” by the scholars of Bastillia, the gnoll bands that eventually grew into the Demonruck were initially thought to be no more than a nuisance. As their numbers and aggression grew, each of the Five Cities attempted to curb the threat. By the time the signatory members of the Five Cities agreed to act together in challenging the Demonruck, the horde had grown too great. As city after city fell in a string of disastrous battles, refugees fleeing the Demonruck moved further and further to the east, eventually traveling across the ocean and founding the community of Sojourn.
Although there has been no sign that the Demonruck have attempted to follow the refugees to their new home, it is a constant fear held by the survivors of their depraved conquest.