In contemporary times, after Tang Ancestor established the Empire and ruled with benevolence, he completely prohibited the Blood Refining Technique and replaced it with the Qi Fortune Method for refining Boundary Stones. As a result, the production of Boundary Stones greatly decreased, but the produced stones no longer had various mind-disturbing flaws.
In ancient times, the blood refining of Boundary Stones had a very high threshold; only an Immortal Master could embolden the embryo of the stone. The war to establish the Great Tang lasted over a hundred years, eventually overthrowing the previous dynasty. More than half of the Immortal Masters perished, and the remaining ones were severely wounded, having no capacity to embolden the stones.
