Goumabyou (業魔病?, lit. "Karma Demon Disease"), known as Daemonblight in the localised version, is a conditional disease which occurs through the events of Tales of Berseria in the world of Wasteland and is the pre-context form of malevolence. Beings who are corrupted or extensively exposed to a form of the daemonblight become monstrous beings called Daemons.
Tales of Berseria
The Daemonblight had been bought into the Desolation world 10 years prior to the main story of Tales of Berseria, where the people opened the gate of hell unnoticed to them, which allowed the corrupting illness called the Daemonblight to spread in many sectors of the world.