In the Cultivation World, pills were divided into four grades: low-grade, mid-grade, high-grade, and top-grade.
Taking the Marrow Cleansing Pill as an example, low-grade ones were the most common. Mid-Grade Pills were extremely difficult to refine, but famous sects and major schools, as well as Demonic Path magnates, could still manage to produce a few batches by relying on their abundant resources and experienced alchemists.
As for high-grade pills, they were exceedingly rare. Yet the major sects passed them down from generation to generation, so they still possessed a few. It was said they had been "accidentally" refined under extraordinarily lucky circumstances.
Last came Top-Grade Pills.
To be honest, virtually no one had ever seen one. They existed only in ancient legends. It was said that they must have existed in antiquity, when Ancient Cultivators possessed boundless Supernatural Powers. As for now... some sects had refused to believe it, clinging to the faint hope of a miracle and expending enormous manpower and resources, yet in the end, they had still refined nothing.
In other words, Top-Grade Pills existed only in the descriptions found in books.
Yet these pills had now become Lin Xuan's only hope. Perhaps only these legendary, heaven-defying pills could allow an ordinary person without a Spirit Root like him to successfully achieve Foundation Establishment.
No sooner had he thought of it than he acted. Lin Xuan began purifying Top-Grade Marrow Cleansing Pills!
However, this was different from anything he had encountered before. After reaching the Great Perfection realm, Lin Xuan could purify even high-grade pills successfully, though the odds were low—out of ten pills, he could succeed only once.
But these Top-Grade Pills...
If he had merely failed several dozen times, that would still have been within Lin Xuan's tolerance. After all, how could legendary pills be