C399 aggrieved sword

In the empty cavern, it was as though the entire mountain had been hollowed out. It stretched all the way to the bottom, but no one knew where it ended.

Yan Yun wanted to leave, but he thought that he could finally leave after breaking the array outside. Unexpectedly, it was an unassailable formation. The only way out was to continue going deeper in.

This formation had to be man-made