The moment he thought of it, he acted.
He Song left the cave with several Thick Earth Talismans in hand, his expression grave.
But the instant he stepped out of the cave, his expression suddenly eased.
Not far away, a Sound Transmission Paper Crane lingered at the outskirts of the Mysterious Trace Array. By the look of it, it seemed unable to find its target.
Spiritual power flowed across the Sound Transmission Paper Crane, flickering with a faint glow, yet it remained utterly still, like an inanimate object.
He Song quickly understood.
After exchanging a trace of aura with a friend, one could release a paper crane or flying bird and use the Sound Transmission Technique to contact the other person. It was the preferred spell for long-distance communication among Qi Refining stage cultivators.
Of course, if the other party was within a defensive formation or used the Conceal Breath Art to hide their aura, the Sound Transmission Technique would be unable to find them. It would only remain where their aura had vanished.
Exchanging auras with a friend was like adding each other as friends, allowing them to use that trace of aura to contact one another.
There was no need to worry about that trace of aura being used to track them.
If one possessed a special spell that altered one's aura, the Sound Transmission Technique would fail.
At the same time, once the Sound Transmission Technique was intercepted, the information carried on it would instantly self-destruct, and the person who cast it would know.
When he had arrived, he had indeed come from the direction where the Sound Transmission Paper Crane now hovered.
When leaving the Immortal Market, He Song had not used the Conceal Breath Art. It was not because he lacked caution; on the contrary,