Gorgon venom

"Gorgon venom" is seen and used in "Buffy the Vampire Slayer: Chaos Bleeds". Giles reveals that gargoyles are susceptible to Gorgon venom, a few samples of which are in the shop. A stake dipped in the venom is sufficient to dispatch them, but Giles warns Buffy to use the right venom; if she uses the wrong sample, the gargoyles will become invincible. Giles states that the venom reacts strongly to anything of gargoyle origin, and Buffy finds an amputated gargoyle claw. Finding that the green venom is Gorgon venom, Buffy infuses a stake with it, and uses it to slay the gargoyles.