C1323 Why Did the Atmosphere Change so Quickly?

Mount Shu imprisoning the Demon Sealing Plate was something that happened a thousand years ago. Even if Taoist Priest Yun Kong had known of the Demon Sealing Plate's whereabouts earlier, he still wouldn't have been able to retrieve the Demon Sealing Plate from the Mount Shu.

But one thing was right.

If they had discovered the Demon Sealing Plate earlier