C269 Antidote
The Yin Fire poison is notoriously difficult to deal with. Once it enters the system, it permeates every nook and cranny of the body, including the blood, Spirit River, and even one's divine sense.
As such, it's incredibly challenging to eradicate. If it weren't, the Master of Wuji Hall would have already found a way to cleanse Chu Yisa of the toxin
