Mechanical guardians are robots found in the remains of Wonder City and seen in Batman: Arkham City and Harley Quinn's Revenge.

Mechanical guardian

concept art


mechanical guardian in harley quinn's revenge

Arkham City Incident

After the assassin disapear, Batman scans the memory of the guardians and we know that the entrance is hidden in a wall. During Protocol 10 the guardians were gathered up in a pile.
Batman Arkham City - Easter Egg 28 - The Mystery of the Mechanical Guardians02:04

Batman Arkham City - Easter Egg 28 - The Mystery of the Mechanical Guardians

Harley Quinn's Revenge

Harley Quinn's Revenge Incident

Harley Quinn acquired the Guardians and used them as her henchmen in the DLC package. After Batman was saved by Robin, Harley unleashed them against Batman, but also took a sniping position on her Joker memorial to help in killing him. It should also be known that Harley painted them to look like Joker.

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