Mordred Deschain

Mordred is a major antagonist in The Dark Tower series by Stephen King. He is the secondary antagonist of the novel The Dark Tower after the Crimson King. He was born of two Red Parents (Crimson King and Mia) and two White parents (Roland Deschain and Susannah Dean.

History
A demon had sex with Roland and took his sperm. Another demon implanted that sperm into Susannah. Both Mia and Susannah simultaneously were pregant with Mordred. They were taken to the Dogan, where Mia gave birth to Mordred. The first thing Mordred did was turn into a spider and eat his mother. Susannah shot off one of Mordred's legs. Mordred was always ravenously hungry and constantly needed food, which was brought to him by the robot Nigel. The Man in Black tried to manipulate him into helping him open the Dark Tower, so Mordred killed him. Mordred pursued Roland's Ka-Tet, eating many people as he went, and eventually was poisoned from what he ate. The Crimson King sent a message to Mordred instructing him to kill Roland so that Mordred could rule Discordia alongside his Red father. Mordred attacked Roland and Oy, the only two remaining members of Roland's Ka-Tet. Oy sacrificed himself to save Roland, who killed Mordred.

Trivia
Mordred Deschain was named after Mordred from Arthurian Mythology