In Stephen King’s novel The Dark Tower VII: The Dark Tower, Roland Deschain’s monstrous son is named Mordred.
Mordred Deschain is a supernatural child connected to both Roland and the Crimson King. His unusual parentage and rapid growth make him a major threat during the final stage of Roland’s quest for the Dark Tower.
Mordred should not be confused with Walter, the Man in Black, or Randall Flagg, who are different figures in the wider Dark Tower mythology. Cuthbert Allgood is instead one of Roland’s former companions from his youth.
The Dark Tower VII: The Dark Tower was published in 2004 and concludes the main sequence of seven Dark Tower novels. Its story brings together characters, locations, and mythological elements introduced throughout the series. Mordred’s role ties the final novel to the series’ recurring ideas of destiny, cycles, divided identities, and the destructive power surrounding the Tower.