Gui Ye's face turned pale the moment Zhang Fei cloned his soul and merged it with his own, simultaneously implanting a demon slave mark into his soul.
Given that his cultivation was far below Gui Ye's, Zhang Fei couldn't do such a thing to him. However, the situation changed once he activated the soul link and borrowed Feng Yao's power, as her cultivation had long since broken through to the Supreme God Realm.
Zhang Fei [5] only borrowed a little of Feng Yao's power, but it was enough for him to surpass Gui Ye's cultivation at the Celestial God Realm.
After that, Zhang Fei [5] took out the science capsule, placed Gui Ye inside, and ordered Mei to extract several parts of her body, including her demon-origin bloodline.
Without Gui Ye's demon-origin bloodline, Zhang Fei [5] could not transform Fei Qinyuan into his demon race because it was the most crucial part.
