After they entered the hall made of black stone, Li Yuanqing slowly descended from the top of the valley. He had already sized up the entire valley from above.
This place occupied a huge area. Moreover, after looking around, he felt that this place did not seem to be natural. If this valley was naturally formed, there would definitely be many traces. The geology would also have a specific shape and structure.
For example, these mountains were all the same height, and the connection with the valley below was a little too flat. It was completely like a building built by humans.
No matter where Li Yuanqing looked or where he checked, the structure here was the same.
However, the tall wall at the end was a little different. It was much taller than the two mountains beside it, and its overall thickness was thicker. The slope of the shape below was also smoother than the other two.
Li Yuanqing told the Blood Vine his doubts.