As you hack into a console the second time you find yourself in the Steel Mill, one of the passwords is "Roman Sionis". If you know your Batman lore (or read the bio), you know him as Black Mask. The reasoning for this password is that -- as shown in the prequel to the series named Arkham Origins -- Black Mask owned the Steel Mill, and was his base of operations.
Contributed By: Rogue_Agent
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