The Man-Bat Serum was a compound developed by Kirk Langstrom in his attempt to try and cure deafness. The serum failed miserably, and as it was derived from the DNA of bats, managed to transform its users into giant Man-Bats. While few of these Man-Bats were able to gain sentiency, the lowest level was the user being aware of their actions and the highest was obedience to another. Most of the assassin Man-Bats were obedient to Talia al Ghul, Ra's al Ghul or other high ranking assassins.

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