"The Huangting lies above, Guanyuan below, Youque is behind, and in front lies Mingmen[1]. The breath flows from the head into the dantian, while water from the Jade Pool nourishes the spirit roots. Cultivate in this manner, and one may attain immortality."

Luo Chen murmured to himself as countless thoughts flowed through his mind.

According to this theory, spirit roots were not completely mysterious and intangible. Instead, they corresponded to several specific locations within the body. The root of the tongue held the upper spirit root, while the dantian housed the middle spirit root. That explained why those born with petrified dantians were incapable of cultivation. As for the lower spirit root, it resided within the testicles or the womb. That, in turn, explained why cultivators were required to preserve their primal yin and primal yang before reaching Foundation Establishment. In doing so, they were preserving the vitality of their spirit roots.

These theories did not arise from nowhere. They were rooted in Luo Chen's own experiences during Foundation Establishment, experiences that...