In his past life, Ye Xuan was an Eighth Grade Soul Emperor and a Ninth Grade Alchemist. What kind of Cultivation Technique hadn't he seen?
Even the strongest King Grade Cultivation Techniques only recorded nine Profound Veins. The concept of a tenth simply didn't exist.
Moreover, having opened all nine Profound Veins before, Ye Xuan could clearly sense that they already permeated every part of the human body, leaving no area untouched.
In other words, there was no space left in the human body for this tenth Profound Vein.
However, the Nine Profound World-Defying Scripture vaguely mentioned a tenth Profound Vein. It just didn't specify where this tenth Profound Vein was located.
It merely said: "Mortals have nine veins, yet a Saint possesses ten. Above the Life Vein lies the one called the Celestial Vein. The Celestial Vein is not manifest; if opened, one transcends mortality to become a Saint. If it remains closed, one is doomed to be an ant."
