Mystic Yin Ghost!
There was no such thing in Du Laoquan's memory, nor were there any related clues.
The name and clues came from Zhang Dake and Ding Yixiu. Both of them had previously come here to gather Mystic Yin Grass. Among the tasks assigned to Qi Refining Realm (Early) disciples by the General Affairs Hall of Miwu Gorge, while this task was hazardous, it was not exceptionally dangerous.
Chapter 199