Initially, Ye Yunsheng did not pay much attention to this so-called "Ancient Treasure Mirror."
Though it was indeed somewhat useful, it was ultimately just an ordinary appraisal Dharma Artifact.
The so-called guidance was nothing more than a common Wind-Seeking or Light-Seeking spell, capable of projecting an unmapped temporary terrain onto the mirror's surface, or helping one find a way out in an unknown cave.
Chapter 825