This alone has stumped countless geniuses.
After all, dominating either spirit or martial arts is already very challenging, let alone mastering both, and they must be of the highest quality.
There's another point, which is the extremely strict requirement for the cultivation technique. According to the National Preceptor, the spirit and martial dual cultivation technique must be from the same origin, with a certain connection between them.
Multiple factors are indispensable.
In tens of thousands of years in Great Yu, not even a handful have entered the unity state.
"You all know?"
This time it was Chen Xuan who was confused, as he had only speculated before, yet he did not understand the reason behind it at all.
"You don't know? Then why are you so calm?"
Yao'Er looked at him with great surprise.
"Sigh!"
Chen Xuan sighed deeply in his heart, indeed, a wealthy family is different, beyond what he could compare with his humble beginnings.
"Explain in detail."
"Hmm!"
