Back then, when Lin Chi's soul token cracked and he died within the Cangnan Secret Realm, the Soul-devouring Demon remained haunted by the incident, determined to find out who exactly had killed his most beloved disciple.
Fifty years later, when the Cangnan Secret Realm opened once again, the Soul-devouring Demon secretly sent disciples to infiltrate it. They located the place where Lin Chi had died in battle. Although Lin Chi's bones were no longer there, they discovered a jade talisman buried beneath the grass and dirt at the site of his death, which had been buried for a full fifty years.
Before his certain death, Lin Chi had secretly imprinted the murderer's Divine Soul Imprint inside the jade talisman.
This was the depth of a True Disciple from a first-class sect, capable of leaving such a contingency even in death.
At that time, Ning Daoran was still green and failed to notice the opponent's subtle tactic.