Wan Yan Jun and his companions knew that the stone in Ling Xiao's hand was a stone capable of storing True Essence, but they were unaware of the marvelous uses of the Array Refining Stone.
Therefore, they didn't give it much thought.
Unfortunately for them, they didn't know that Ling Xiao had already refined the "Plague Osteoporosis Array" into this Array Refining Stone, which could be used on the spot without any materials in the future even once.
If he wanted to use it multiple times, however, he would need to replenish the materials.
Ling Xiao picked up the Array Refining Stone and placed it into the Mountain and River World before pointing to the spot where the Demon General had vanished and saying, "My Senior Brother Chen Zui, do you think I'm up to the task now?"
At that location, a staircase leading underground had appeared, clearly carved out directly and laid with stone slabs.
