The Chief Altar Master had doubts about the memories related to the gu insects Cultivator Du had lost, but compared with the news of Huiyan Hall, matters concerning the breeding of gu insects were no longer so important. Thus, he did not immediately investigate the cause.
Moreover, he had also obtained the set of incantations capable of detecting whether someone had a Brain-Twining White Corpse Gu planted within their body. This already delighted the man in purple robes.
The other party's method was a spell specifically designed to detect the Brain-Twining White Corpse Gu. Compared to his own brute-force approach of overwhelming ten techniques with one strength, it was far, far easier.
This method was clearly a supporting incantation for raising this gu insect. It was among Huiyan Hall's most closely guarded secrets and would not be easy to obtain.
With it, once they found sleeper agents again, they could swiftly identify them. Yet, as Su Hong had said, the spell still had to enter the other party's body.
The other party would also sense that someone was probing them, so it could only be used on people already under their control. Even so, it solved a great deal of trouble.
But unexpectedly, Su Hong now said that there was an even stronger detection method, one that did not require casting a spell inside another person's body. She even said that the cultivator using it did not need to possess profound cultivation!
This meant that Su Hong knew of another, more powerful incantation, or else knew how to refine some magical treasure capable of conducting such a search!
All three were intelligent people and immediately grasped the crucial point. The beautiful woman in azure palace robes above also instantly forgot her displeasure from before. This matter was far too important.