The Herculeans were a vassal race in subjection to the Charon Dominion, following their defeat and induction after the Oblivion Crusades. Although one of the "youngest" species to have been inducted into the Dominion before the stabilization of the Hellmouth , the Herculeans quickly became among the most powerful races under the Dominion, and arguably the most feared sight on the battlefronts during the Extant War.