The setting is a once prosperous kingdom, which, due to an attempt to ban alchemy, quickly plunges into chaos. The main character, a man suffering from amnesia in a plague doctor mask named Corvus, must shed light on the events. The hero can both use conventional weapons and kill enemies with the “power of disease” — these are special skills that drop from bosses. In addition, there are several endings: the ending will depend on the decisions made and the items collected.