Batman: Arkham Origins/Dark Knight System

The Dark Knight System consists of challenges that are divided into four areas. Each challenge has to be completed in rank order. Some unlock specific WayneTech upgrades when completed. Completing all challenges unlocks the Batman The Dark Knight costume. There are limited number of predator encounters, so the challenges in Worst Nightmare may be missable in a single playthrough. However, progress is carried over in a New Game Plus.