Born Lin Kojui and titled the "Lin Gray", the Rat King is the undisputed dai lo of Lungmen's criminal underworld who has reigned over the slums of Lungmen for many years. This Zalak may appear old and frail – having trouble walking even with his cane. But his mastery over sand-based Originium Arts makes the Rat King a formidable opponent in battle nonetheless. Anyone who dare to oppose him has never left the slums to tell the tale.