Terms of the deal (4)

"A palace realm expert..." Yang Qing threw a curious glance in Duan Hu's direction. Based on the foundations Wu Mingli had, Yang Qing was inclined to believe that the person who handed him that recording was indeed a palace realm expert, a quasi-palace stage expert would not have been able to sneak on him undetected, after all, just from the undulations he released, Yang Qing could already tell that Wu Mingli was someone with a gold core.

With such foundations, a quasi-palace stage cultivator would find it difficult to sneak on him undetected. Anyone with a blue core and above would have a robust spiritual sense, courtesy of their spiritual core.