The monstrous offspring of Roland and Susannah, conceived through supernatural means and born in Song of Susannah. Mordred is a shapeshifter capable of taking a spider-like form, and carries the blood of both Roland and the Crimson King. He is born with an instinctive hatred of his white father and spends the final book hunting the ka-tet across a dying Mid-World. His end comes at the hands of Oy, in a confrontation that costs the billy-bumbler his life.