D&D 5e Dungeon Master's Guide
Poison
Varies Natural
Creatures whos wounds are exposed to this venom by a creature, object, or weapon must succeed on a DC 15 Constitution saving throw, taking 24 (7d6) poison damage on a failed save, or half as much damage on a successful one.
This poison must be harvested from a dead, incapacitated, or willing wyvern. It's sharp acrid smell and vibrant green color reveal it's true danger. This is a deadly venom. The Ei'tono Tribes of southern Gora are famous for their skills at taming aerial creatures, and have had their work financed and used by surrounding parties to aid in the taming of Wyverns.
Cost: 1,200 gp
Weight: .4 lbs