Fear Toxin, also known as Fear Gas is a chemical compound created and used by Scarecrow. When Batman fought back the effects from his third exposure to the gas and managed to grab onto Scarecrow during it, Crane used his claws to inject Batman with enough Fear Toxin which, according to him, would drive ten men insane. However, Batman also fought through the effects of this Fear Toxin, causing Crane to stab Batman's arm in order to escape his grip, and made his way down into the sewers underneath Arkham.
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