Scan them to solve. "A psychotic doctor who caught the fear bug, the fruits of his research: a powerful drug." In the southern sector of Arkham Knight HQ south is a swarm of Scarecrow's fear bugs.

Not only is the implication of this suit great for its familiar treads with a Batman infected with Joker’s blood in Batman: Arkham Knight ... it’s the Hellbat suit. The Hellbat armor was ...