The Jade Records were given to Lu Sheng by Ju Yan. However, due to specific reasons, Lu Sheng did not believe most of the Jade Records' contents. Of course, it was still dependable as a reference.
As for the Spiritual Power formula, he had attempted it a few times. He did not bring his dozen or so Guardian Spirits back with him this time. He did not notice any marks of the existence of Spiritual Power in the Great Yin anyways.
It seemed that this was not a space suitable for Spiritual Power's existence.
That was strange.
Within the Prime Devil Sect's Devil Palace, Lu Sheng sat within the Research Temple. Many Divine Weapon fragments were scattered all around him. An oval pool was even built on the right before him. The pool was tough and dark blue in color. The heads of a wolf and a serpent were even sculpted on one side using a black metal. This was the Saint Weapon Pool he'd built when he wanted to create Saint Weapons back then.