The first stage of the "Heaven Son's Insight" was the Soul Changing Realm, the fundamental level of solidifying the soul.
The second stage was the Imperial Soul Realm, in which one could acquire peculiar techniques to manipulate powerful individuals who were superior to the techniques' practitioner. This had aided Su Yu numerous times.
The third stage was the unknown Illusionary Soul Realm.
"You've accomplished Stage Two Top Class, so the Stage Three training strategies should have appeared on the bronze slab by now. If you have time, you can begin comprehending it by referring to my instructions," Yun Yazi said.
He placed great importance on Su Yu's "Heaven Son's Insight" training. Strangely, Yun Yazi's Divine Path many years ago wasn't the Path of Souls. Yun Yazi had obtained the "Heaven Son's Insight" from a very mysterious relic and had begun cultivating it under unplanned circumstances.