Majin

The Majin  (魔人 the Demon) is the evil entity that first appeared on the continent 1000 years before the beginning of Rokka no Yuusha. It killed many people for no apparent reason until it was defeated by the Saint of the Single Flower who managed to seal it away temporarily. Over the next 1000 years it escaped twice only to be beaten by the next two generations of Braves.