Fate/Apocrypha is an action-fantasy light novel and anime series set in the Fate universe. It centers on a conflict between two factions, the Black and Red teams, who summon legendary Heroic Spirits to battle over the powerful Greater Grail. The story follows Sieg, a homunculus who becomes involved in the war and seeks his own path amid the chaos. It is known for its large cast, intense battles, and alternate-timeline premise.