Currently, Xu Hei is able to fully peruse all the ancient scriptures of Emperor Yuan.

In the ancient scriptures he obtained, both the Etheric Undying Body and the Diamond Suppression Technique only have eight levels.

This means that as long as Xu Hei takes another step forward, he will reach the level of Emperor Yuan.

Although Xu Hei is still a bit short, with the third transformation of Nirvana, he is confident that after his transformation, his physical body will not be weaker than Emperor Yuan's.