C2074 An Unfamiliar Environment

What is this?

Lu Shan had a question in his mind. This was not an ordinary fog. He was most familiar with this fog, and it was not an ordinary bead either.

It was the spiritual energy that had reached a certain level. Lu Shan only took a light breath. He felt that his soul had almost reached the saturation state. The speed of his cultivation in the mine vein was simply indescribable