"The Magician King" is a fantasy novel by Lev Grossman and serves as the sequel to The Magicians. The story follows Quentin Coldwater, who is now a king in the magical land of Fillory, as he embarks on a quest to reclaim his lost power and confront the challenges of leadership. Throughout the novel, Quentin and his friends face various trials that test their abilities and relationships. The narrative explores themes of responsibility, identity, and the consequences of magic, while also delving deeper into the lore of Fillory and its inhabitants.