Kell Maresh is a fictional character from the Grishaverse, a series of fantasy novels written by Leigh Bardugo. He is known as a skilled and charismatic thief with the ability to travel between different worlds. Kell is a member of the Maresh family, which rules the nation of Ravka. In the series, Kell possesses a unique magical power called Blood Magic, allowing him to manipulate the elements and perform extraordinary feats. His adventures often involve navigating political intrigue and forming alliances with other characters, such as Lila Bard, who becomes a significant companion in his journey.