Huo Hai gave it a try and discovered that the Mental Power Crystals he had collected earlier were indeed no longer very useful. Perhaps they would completely lose their effect once he reached the Seventh-Level Spirit Emperor.
However, Huo Hai had already noticed that their effect on him had weakened to the limit. It was very likely because his Mental Power was simply too powerful. In any case, even if he consumed a large number of Mental Power Crystals now, his Mental Power would only recover a tiny bit faster than it did naturally. It was nothing worth mentioning.
As his strength increased, the Mental Power consumed each time he inscribed a rune also grew greater and greater, while its recovery became slower and slower. Huo Hai finally understood why high-level Spirit Emperors were so rare.
It was not merely the time wasted inscribing runes, nor only the time wasted when bottlenecks blocked one's cultivation. Most importantly, Mental Power recovered far too slowly. The Mental Power consumed in the past could be restored within a few days, but the Mental Power required to inscribe a rune now could not naturally recover to the Perfection Stage even after a month.
Huo Hai shook his head helplessly. Fortunately, after reaching the Spirit Emperor Realm, one's will had fused into one's own spiritual energy. Mental Power had less and less influence on the individual; usually, spiritual energy alone was enough, and not using Mental Power had little effect.
Otherwise, who knew how many Spirit Emperors would die while waiting for their Mental Power to recover? "Forget it. I'll temper my soul first." Huo Hai continued releasing the soul power stored within the Spirit Formation. He had no idea just how much it contained.
Meanwhile, his Spirit Insects had also drawn very close to