Kai knew the formula for making a Minor Poison Arrow, but he had never bothered to learn the formula for an antidote to any poison. There were many available in the player-operated shops all over Stonebinder cities, so he never felt the need to learn it.
Even though he didn't know the exact formula, Kai had seen the list a few times in his last timeline circulating on online forums. Based on that, he gathered some ingredients from market: Bloodroot, Wyrmspine Bark, Ashcap Mushroom, Crystal Aloe Gel, Distilled Water, Quicklime, Serpent Venom, and the Stings of Mutated Horn Creepers.