Bane was a brilliant world-class fighter and tactical genius who augmented his great physical strength with a steroid called Venom.
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History
When the Venom was injected into his brain (from a dispenser usually mounted on his arm, and fed through tubes connected to his mask), he achieved superhuman strength and endurance (although not enough to defeat Superman). However, the Venom could be dangerous when used in excess. During their first encounter, Batman defeated Bane by triggering an overdose of the drug into Bane's head, stopping the flow before Bane literally burst.