The Green Emperor was someone who overlooked the world, a character who dominated an era. How could a cultivation technique he favored be useless? That's a joke.
Moreover, Lin Feng cultivated the Longevity Technique and never faced a situation where he ran out of True Qi. With the ability of one Spirit Knot, he consecutively used three Earth Rank Martial Techniques, which even those with the cultivation of the Second Spirit Knot might find it difficult to accomplish.
Therefore, this cultivation technique doesn't need any evaluation on its level.
Qin Ya was the first to bid: "Three hundred Spirit Stones." The starting price for this cultivation technique was already two hundred and fifty Spirit Stones, comparable to a Low Grade Spiritual Artifact.
"Five hundred Spirit Stones," Bi Zhongtian shouted. Obviously, he also took a liking to this cultivation technique.
"Six hundred Spirit Stones," Qin Ya said calmly.
