That stone door was truly a work of supernatural artistry.
If the stone door could be opened, and there was another universe behind it, the praise of supernatural craftsmanship would be even more fitting.
Yang Xiao felt that there was a very high probability the stone door could be opened, otherwise why would the builders of this place have gone to the bizarre trouble of leaving a stone door in the mountainside, if not to seem superfluous?
However, upon thinking this, Yang Xiao became uncertain again.
If the stone door really could be opened, how then should one open it?
Given the size of the stone door, it was not something a few people could simply push open.
This precisely was the true cause of Yang Xiao's astonishment, compared to the stone door, secret cave entrances, mountain pathways, and the empty space within the mountain were all insignificant.
At this moment, Yang Xiao could only look towards the white cat again.
