Su Wenxuan could conclude with certainty that these three failed pills were not the result of any technical flaw in his own alchemy. That left only one possibility: there was a problem with the spiritual herb itself.
The catch, however, was that the substandard spiritual herb had already been mixed in with normal ingredients and refined. Now, they could only extract some residues from the three failed pills as evidence of the herb's defect.
Fú Yòu seemed to have realized this as well. "Could it be that the spiritual herb underwent some kind of degradation, resulting in unqualified ingredients and thus producing failed pills?"
Chapter 357