Back when they were in the Misty Forest, they discovered a patch of land teeming with vitality in the core area, and later found the origin vine gnawed bare by monster beasts underground.
Through the meticulous cultivation of the Four Great Sects, that origin vine had since grown two leaves.
If she carried these two leaves with her and chewed on a tiny bit whenever she felt unwell, it probably wouldn't be a big problem.
Chapter 497