Zhou Yan was stunned for a moment, then without hesitation, stepped forward.
The space rippled slightly, with the aura of runes flowing, but the scene did not change in any way.
Zhou Yan's gaze swept around, releasing a trace of divine soul sensing power, and immediately discovered what was unique about this area.
The flow of those runes was like a mountain spring flowing on a path of rules, its moving traces without rules, yet quite complex.
This was not any particular rune flow, nor any specific rune combination method.
But Zhou Yan was very familiar with this pattern, and he even clearly knew the most correct rune flow method, the most correct path to take.
Because the way the runes flowed, those rune patterns were exactly the same as those on the turtle shell of the Luo Book River Map, as if the runes were copied down with not the slightest difference.
This was originally a very puzzling matter.
