The Vital Energy and Power in Dragon Prison Space was corrupt and chaotic, intensely corrosive to cultivators' bodies and capable of depleting their magical power. Purifying that corrupt Vital Energy and Power into energy that could be absorbed and refined was decidedly beyond the capabilities of an ordinary purification formation.
This required Qin Fengming to create an entirely new formation himself.
A purification formation specifically designed for the Vital Energy and Power in this space.
Qin Fengming had no choice but to do this. Not only did he need immense Vital Energy and Power for his own cultivation, but the many spirit beasts and spirit insects within his Xumi Cave Dwelling also needed vast amounts of energy to cultivate.
Without replenishment from pure Vital Energy and Power, the Xumi Cave Dwelling would become like Xiao You's Sumeru Space treasure and eventually collapse on its own. Of course, that would be a lengthy process, not something that happened overnight.
For these reasons, no matter how difficult it proved, Qin Fengming had to devise a purification formation.
With no sun, moon, or stars revolving overhead, there was no way to mark the passing days. Qin Fengming sat cross-legged in the stone hall and did not leave again.
An unknown stretch of time passed before Qin Fengming suddenly opened his eyes and rose to his feet. By then, more than a hundred thousand top-grade Yin Stones around him had turned into ordinary rocks.
Neither joy nor worry showed on Qin Fengming's face. His gaze was calm and untroubled, and he appeared utterly composed.
Leaving the stone hall, Qin Fengming summoned He Xuan and began excavating earth and stone on the small island, which measured only a few dozen li across.
He gave He Xuan an animal-hide map and instructed him to dig deep