Venom (Earth-1)

Venom is a unique steroid, used primarily by Bane.

History
Venom is the source of Bane's immense strength, which he has used to try and defeat Batman, but to no success.

Batman VS Killer Croc
It was later used by Killer Croc in a fight with Batman and Robin. However, the Venom didn't have the same effects on Croc as it did Bane, and he was defeated rather quickly.

Related

 * Appearances of Venom