Jiang Ping An finally understood why the Old Ancestors of Nether Moon Palace were so concerned about fiends.
These fiends' ability to infiltrate was simply too terrifying.
The Demon Race was currently humanity's greatest enemy, but the Demon Race stood out in the open, allowing humanity to prepare and resist them.
These fiends, however, were different. They hid in the shadows, constantly parasitizing others and expanding, leaving their traces difficult to find.
The reason they were so difficult to track was because these fiends handled secrecy exceptionally well.
Every time a fiend parasitized someone, its superior used a special immortal art to place a shackle upon its soul, causing it to forget information related to its superior as well as memories of its previous life.
For example, Jiang Ping An could read this fiend's memories after it had parasitized Hong Yu, but he could not read anything that had happened to it before it parasitized Hong Yu.
Hong Yu was responsible for finding new hosts for the fiends sent down from above, and he had become the leader of those new fiends.
Using an immortal technique provided from above, Hong Yu sealed the memories of the newer fiends beneath him, making it impossible for them to learn his specific information.
That way, even if those beneath him were exposed, Hong Yu would not be implicated.
If Ni Hong had not taken the initiative to bring Hong Yu here this time, Hong Yu would not even have remembered that Ni Hong was his superior.
That was why the Old Ancestor of Nether Moon Palace had said that soul-searching could only reveal that the fiends within Nether Moon Palace came from this route, while the specific circumstances here remained unknown.
It was because these fiends had sealed away memories of their superiors,