| The subject of this article is non-canonical.|
While created as part of licensed material, it has not been confirmed as part of the "real" Buffyverse.
"Gorgon venom" was magical substance that gargoyles were susceptible to. The Magic Box had a sample of gorgan venom among various other venoms of different colors. A stake dipped in the venom was sufficient to dispatch gargoyles, though the right venom must be used; if one used the wrong sample, the gargoyles would become invincible.
Rupert Giles stated that the venom reacted strongly to anything of gargoyle origin so Buffy used an amputated gargoyle claw for catalyses. Finding that the green venom was Gorgon venom, Buffy infused a stake with it, and used it to slay a bunch of gargoyles that attacked the Magic Box.