This was what Chen Fei discovered when he killed Zhang Chaoyun and extracted his spiritual essence. When Chen Fei used the Spirit Slaughter Technique, he had only intended to extract the spiritual essence of essence, energy, and spirit. As for the spiritual essence of the soul, he had not dared to hope for it.
Yet unexpectedly, he had extracted even the soul's spiritual essence in the end. Though it had been somewhat forced, he had truly succeeded.
Afterward, Chen Fei tried erasing the soul traces he had left in the Void. That too was possible, just as it had been back when he was in the Joint Aperture Realm.
Other cultivation arts all needed to be fused anew with Mountain Sea Realm techniques. Only this incomplete form of the Spirit Slaughter Technique did not, making Chen Fei suddenly curious about its origins.
Back then, Chen Fei had merely learned this Spirit Slaughter Technique by chance from a strange creature in a third-tier Ghost City.
Moreover, that strange creature had been eliminated by Chen Fei using the rules. Now, even if he wanted to seek out the origins of the Spirit Slaughter Technique, he did not know where to begin.
For an incomplete technique to be usable from the Aperture Refining Realm all the way to the Mountain Sea Realm proved that, in essence, it was a cultivation art above the Mountain Sea Realm.
Yet it had been optimized so well that it could be cultivated even in the Aperture Refining Realm.
Chen Fei dispersed the spiritual light at his fingertips. The Spirit Slaughter Technique was still highly useful for extracting spiritual essence and severing soul traces, but it could no longer enhance attacks. In the end, it still had its limitations.
Perhaps only if Chen Fei had the chance to