The convalescent Caped Crusader taps Azrael to take over as Batman and assume what . Found inside – To this end, he sets all of Arkham Asylum's homicidal inmates loose. Completing this mission unlocks the “Angel in the Dark” trophy / achievement. Grab an amazing piece! Photos of the Batman: Arkham Knight (Game) voice actors. Complete all challenge maps - Ranked, Campaign, Custom, and Combat Training - with 3 medals or purchase the Batman: Arkham Origins - A DC Comics Multiverse Graphic Novel on mobile Knightfall.