Jia Ren took out the refining method of the Birthless Killing Sword and studied it carefully.
The Sky-reaching Spirit Treasure could be called the pinnacle of Artifact Refining, and the Mysterious Heavenly Spiritual Treasure was a preeminent treasure born innately.
The only Mysterious Heavenly Spiritual Treasure refined by mortals was one created by the founder of Lingbao Sect, who relied on his exceptional Heavenly Treasure Body to refine it.
In the Mysterious Realm, only Ma Tianbao was able to replicate this feat. Besides him, no one could refine a Mysterious Heavenly Spiritual Treasure.
The Sky-reaching Spirit Treasure was the ultimate goal for an Artifact Refiner.
The complexity of refining the Birthless Killing Sword far exceeded that of a common Spiritual Treasure, and its Heavenly Treasure Patterns were the essence of the Sky-reaching Spirit Treasure.
