This ancient method of artifact refinement, in which one personally added a soul spirit, had not been eliminated like other ancient refining methods because it possessed commendable advantages. Its shortcomings, gradually cast aside by the changing times, were not merely its cost, but also that its compatibility fell short of naturally born artifact spirits. This was also why it was unsuitable for refining lifebound artifacts.
But if one was not refining a lifebound artifact, then given the means, many were still willing to personally add a soul spirit during refinement. Doing so could make the refined item even more powerful. It was precisely because acquired soul spirits were insufficient that later generations devised a refining method allowing Dao materials to naturally give birth to life, using it as a replacement...
After erasing Zhang Zhengyang's will, you successively took the multicolored skeleton in the underground chamber—an Immortal King's acquired Supreme Dao Bone—the black-and-white Xuanqing Dao Robe, the three rings near the multicolored bone, and two perfectly preserved books. One recorded experience with puppets and formations, while the other recorded the secret art Universe Inversion, a secret art that allowed the Immeasurable Universe to possess the ability to transport Immortal Veins.
After sweeping away everything, you found that special item and obtained a mark that allowed you to freely enter and leave the Zhengyang Realm. This mark was rather simple and could even be transferred to another person. It was another form of tangible object, so you did not need to worry too much that this mark was also someone else's hidden scheme. Furthermore, this art had not been obtained by Zhang Zhengyang from the Great Void Realm. It was merely a widely used technique; only the object used as its "key" was rather rare.
Before leaving the Zhengyang Realm, you went