Above Immortal Ascension Realm!!
Gu Yao was feeling both ecstatic and anxious at the same time. Ecstatic because his plan was finally in its second phase and anxious because of Lin Mu. He was still confused about how or why the restrictions and seals were not working on the boy.
He could understand the case with the supreme elder of the Tri cauldron peony sect as the man was near to him in terms of cultivation base, while in the case of Wu Teng it was because of his willpower and him lowering the restrictions back then.
Another thing was their bloodline itself. The bloodline of the Gu clan flowed in both of his nephews, and it was also why his skills wouldn't work properly on them. Gu Yao himself was unsure about the things that he had learned from that invader.