The recipe for this extremely potent poison is thankfully lost to time. A single drop of this venom is enough to incapacitate an adult dragon. Only a few bottles are known to exist, and are highly sought after by assassins, alchemists, and monster hunters alike.
The clear, slightly grey liquid comes in a runeglass phial, and its stopper is secured with black wax. Inside the liquid floats a single death's head moth. Some have theorized that the poison is the blood of Loki, the god of snakes and spiders. Others firmly believe that it was harvested from the fangs of Jormungandr. Yet others see it as the masterpiece of a forgotten mortal alchemist, who upon realizing the potency of their creation burned their notes and drank one of the doses they had made in order to ensure the knowledge of its creation stayed hidden.
When administered to a creature, they must make a DC 20 Constitution saving throw. On a failure, they fall to 0 hit points. On a success, they take 78 (12d12) poison damage.