Chu Feng knew the crux of his problem lay with the little black and white grinding stone. If he could solve this problem, then his body would be completely fine.
He had failed to do so previously and only discovered the fundamental change in his situation after entering the weapon nurturing domain.
Yellow Ox had told him that the black and white substance was transforming and would condense into an object. He had mentioned that if the object was formed in the end, it would help Chu Feng purify his energy and refine his blood essence, etc.
There was also a similar priceless item in Yellow Ox's body. It was a light yellow medicine mortar and pestle, something left behind by a Bodhisattva level expert.
It was an extraordinary item that was half material and half energy. Only fairies and saint children from top-ranking orthodoxies possessed such things because they were simply too rare.
Some worlds would only have one such item passed down since antiquity.