The Rukun's Juice was the only known antidote against the deadliest of the Scorpion poisons, the Fuantei Shi. It was named after the Kitsuki who discovered it, Kitsuki Rukun. Small doses of Rukun's Juice must be given to the victim immediately after ingestion of the poison. Once symptoms appeared, the antitoxin was less effective, but had still been known to save lives. Kitsuki have also learned to keep the victim alone and to extinguish all but necessary light, to prevent aggravating the spasms.