C106 Heavenly Dragon Nine Transformations

Why didn't these people know the "Sky" level of Ninth Grade or Nine Transformations Celestial Dragon and Martial Soul s?

After all, six thousand years ago, when he himself awakened the Nine Transformations Celestial Dragon, he became invincible throughout the entire Three Desolate and Six Paths World.

As long as Nine Transformations Celestial Dragon s were mentioned