He was the seventh prince from the Empire that was destroyed five years ago due to the revolt. Lux met with the princess of the new Kingdom, Lizsharte, by accidentally breaking into the bathroom of the girl's dormitory. He is a Drag-Knight who is called the “Weakest Undefeated” and also the "Black Hero." He is the user of the Divine Drag-Ride "Bahamut."
He was expected to be a hero for his former empire, but became its destroyer.