C659 The Nonexistent Mount Kongling

Lee Yifann's eyes were fixed on a certain line of text, "Five hundred years ago, after the catastrophe in World of Martial Dao died down, was the Nine Revolutions Indestructible Devil Arts sealed? But no one knew where it was? It should be the location of the Nine Revolutions Indestructible Devil Arts on the map. The Black Tortoise should be some kind of special sealing Barrier