Although the Pure Spirit Divine Eye did not reveal much of its power here, it was naturally still superior to a cultivator's eyesight and divine sense when it came to detecting certain subtle things in the air.
After Qin Fengming began to suspect something about this place, he circulated the spiritual power within his body and engraved several simple runes in the air to test the formation.
Naturally, these runes engraved in empty air could not receive energy from their surroundings before forming a formation, so they could not remain for long.
However, they possessed one powerful advantage: they were not constrained by the energy around them.
Even if a powerful formation existed, it could not make them vanish instantly. According to Ancestor Daoyan, these runes had been passed down from the Immortal Realm. A formation from the Spirit Realm could not make them vanish at will; otherwise, Ancestor Daoyan, a great master of the Path of Runes, would not have regarded them as an inheritance.
After Qin Fengming released these runes, he passed through several more valleys and, relying on the Pure Spirit Divine Eye, sensed the runes lingering in the air and on the verge of disappearing once again.
Upon suddenly seeing this, he could not help being greatly startled.
However, he did not stop at once. Instead, he continuously released more runes. Just as he expected, after passing through several more valleys, the runes he had released earlier appeared before him once again.
By this point, if he still could not confirm that this was a powerful phantom formation, then he truly would not be Qin Fengming.
Hearing Chu Shixian's question, Qin Fengming did not offer much explanation. He merely raised a hand, and a mass of energy swept out. After rolling through a certain spot in