C942 Highgrade Soul Hunting Pill

The other Grade Five Alchemists concurred with the master's earlier statement.

The key was indeed in extracting the impurities from the herbs.

They needed to use a gentle flame to slowly roast the herbs, utilizing the Pill Furnace's ability to absorb impurities to expel them. Yet, even with such techniques, they could only eliminate 90% of the impurities