A monstrous rat the size of a cow, standing on its hind legs at about 5 feet tall. Its fur is primarily white, with a distinctive black crown-shaped marking on its head. The creature's body is grotesquely deformed, covered in large, bulbous tumors and a network of scars. Some of the tumors have burst, oozing a viscous fluid. The Rat King has one intact eye that glows an intense, menacing red. The other eye socket is a clotted, weeping mess, the result of a recent injury. Its snout is elongated and scarred, with visibly sharp, yellowed teeth protruding. The creature's forepaws have developed into hand-like appendages with long, sharp claws. Its tail is thick and hairless, dragging on the ground behind it. Despite its massive size, the Rat King's posture suggests both power and pain, with a slightly hunched back due to its enormous tumors. The Rat King stands in a dimly lit, decaying environment, casting a long, ominous shadow. Its expression is one of malevolent intelligence and barely contained rage.