Scarecrow threatens Gotham with a new fear toxin and forces the city's evacuation. Batman pursues him, rescues Poison Ivy, and traces the toxin to Ace Chemicals — where the Arkham Knight's militia is waiting. The building is rigged as a bomb and Oracle is Scarecrow's hostage. Meanwhile, Joker-infected blood from before his death has created four individuals transforming into him — including Batman himself, who has been hiding his infection. The Joker manifests as a mental projection, manipulating Batman's perception throughout. A Batman: Arkham Knight DLC skin with this cosmetic and story context.