Zhang Yu noticed that whenever these Profound Court Daoist texts discussed ritual-refining an artifact to protect the Void Abode, the annotations left by predecessors invariably stressed that this must never be entrusted to another's hands. Even the closest of kin could not be relied upon; one had to do it personally, or tremendous hidden dangers would surely be left behind.
He agreed with this. Even for someone one could trust absolutely, it was best not to place an opportunity for exploitation before them. It was bad for both that person and oneself.
There were chiefly two methods of ritual-refining such a protective artifact. One was to take a treasure born of Heaven and Earth's spiritual essence and refine it for one's own use. What sort of artifact was refined was secondary, and there was no need to be overly demanding about the refining techniques. The crucial point was that the treasure material taken must be of the highest quality; only then, once refined, could it return to emptiness and enter the void, to be used by oneself.
After the Profound Court occupied the Upper Layer, such treasure materials were not actually scarce. He could exchange Mystic Grain for them, then slowly refine them according to the prescribed method, and should be able to produce one.
The Daoist texts also mentioned that ownerless spiritual treasures of Heaven and Earth were the finest, for they could be used as soon as they were acquired. Not only could they provide protection, but they also required little effort, and could be borrowed for cultivation in ordinary days. However, the annotator's tone carried a hint of envy, so they likely did not possess one themselves and could only sigh over others' fortunes.
At this thought, he realized that the divine tree could serve this purpose