After Corvus returns from his banishment, he finds that a mysterious plague has swept the land of Parthoris, taking the sanity of those it does not kill. Corvus, the protagonist of the first game, is forced to flee his hometown of Silverspring after the infected attack him, but not before he is infected himself. The effects of the disease are held at bay in Corvus’ case because he holds one of the Tomes of Power, but he still must find a cure before he succumbs.