The natural venom of a yuan-ti is both extremely potent and extremely valuable on the black market, where it's sold as a a spell component, potion ingredient, assassin's poison, and more.

Any creature that consumes or comes into contact with this poison must make a DC17 constitution saving throw. On a failed save, a creature takes 2d12 poison damage. On a successful save, a creature takes no damage.

This substance is extremely rare and extremely valuable, and can be sold for a high price to physicians, apothecaries, and alchemists, among others.

Notes: Damage: Poison, Damage