C473 The Words in the Time Scroll
However, Ye Hongtian's returning to his original state was caused by his cultivation of the 'restraining breath technique'. With the 'restraining breath technique', even some peak true essence masters wouldn't be able to see through Ye Hongtian's cultivation.
As for those in the Source of God Realm, if they wanted to see through Ye Hong Tian's cultivation level, it was still very simple