His spiritual power finally found somewhere to go, pouring into it like a burst dam. Under the operation of the Purple Mansion Spirit Refining Method, that space visibly expanded outward, growing larger and larger.
An invisible vortex appeared above Uchiha Yan's head, madly drawing in the natural energy diffused throughout the surroundings.
Ordinarily, absorbing energy at this rate would have made him burst apart from the violent natural force long ago, turning him into a stone statue. But the Purple Mansion Spirit Refining Method was different. Once that violent energy passed through the method's circulation, it immediately became as docile as a kitten and obediently flowed into his body.
This pure energy continuously transformed into spiritual power and soul power, flooding into the Purple Mansion region between his brows and continuing to force open and expand that mysterious space.
From one zhang to ten zhang, then a hundred zhang... It kept expanding until it reached 1,296 zhang. Only then did the newly opened space finally stop growing and slowly stabilize.
Throughout the process, Uchiha Yan's spiritual power and soul power rose along with it. His spiritual power increased tenfold, while his soul grew by more than ten times—and it was still rapidly climbing.
Before long, he clearly sensed that the Mental Sea he had once been so proud of had been completely swallowed by this new space, leaving not even a trace behind.
Only then did he truly understand—the Mental Sea he had possessed before was merely an incredibly tiny corner of the Ancestral Aperture between his brows. If one failed to truly open the Ancestral Aperture, that would remain one's Mental Sea for life, and expanding it even a little would be difficult.
But now, things were different.
Once the Ancestral Aperture between his brows had opened, it directly