"King of Scars" is a fantasy novel by Leigh Bardugo, set in the Grishaverse. It follows the story of Nikolai Lantsov, the young king of Ravka, as he grapples with the consequences of his past and the dark magic that threatens his kingdom. The narrative intertwines with the journeys of Zoya Nazyalensky, a powerful Grisha, and Nikolai's struggle against a looming war. The book explores themes of identity, sacrifice, and the burdens of leadership, while expanding on the rich lore of the Grishaverse established in previous works.