The Winter King episode 4 explained in detail.
Summary SCREENRANT VIDEO OF THE DAY SCROLL TO CONTINUE WITH CONTENT This article contains discussion of sexual assault.
6 Merlin Tries To Kidnap Mordred The fourth episode sees the return of Merlin , so is pleased to see Arthur came back to the kingdom after he previously refused the call. However, it seems the two are destined to be at odds over the fate of Prince Mordred. In the first episode, the magician touched the newborn Mordred and had a terrifying vision of the grown Prince slaughtering his own people while wearing a golden mask.
Later in the episode, Merlin realizes that Nimue is pregnant with Gungleus' baby. Her initial reaction is shock and revulsion, but when she refuses to have the child, Merlin chastises her. He claims her pregnancy was "willed" by the Gods themselves, and the fact Gungleus is a King makes the child potentially important. Disturbed by Merlin's response to the pregnancy, Nimue flees Avalon when his back is turned.