Chapter 681: The Boundary Stone of Heavenly Yin World

When the next day dawned, the darkness withdrew rapidly. No matter if it was east or west, all of the darkness flooded back to the cliff. Everything vanished at the cliff where the source of Surging River was.

Qin Mu hurriedly flew forward and was roughly six hundred yards away from the cliff. From south to north, he started searching.

Twang!

The formations in his eyes activated and instantly, two beams of light that shone onto the mountain. Not a single crack on the mountain could escape his eyes.

Qin Mu referred to the light spots he had marked and started comparing them to the cliff. He searched all the way to the north before searching all the way back to the south. After a moment, he surveyed the cliff once again.

The cliff was very high, and it was pretty uneven. The complicated terrain made searching to be quite an exhausting task, but it was the simplest and most effective method.