A Record of a Mortal’s Journey to Immortality (Chapter 2001-Chapter 2248)

"Even true immortals are unable to perfect this secret technique? Has there really been no one that's managed to break the mold and completely master this technique?" Han Li asked with a grim expression.

"At its core, the Spirit Refinement Technique is a technique that stimulates the latent potential of one's spiritual sense to drastically enhance it. The one who invented it was an extremely renowned figure in our True Immortal Realm, and it's certainly no easy task for others to try and perfect it. There have been several other spiritual sense secret techniques invented with the Spirit Refinement Technique as reference, and they're all a lot safer than the Spirit Refinement Technique, but they obviously work nowhere near as effectively.

"As for whether anyone has ever fully mastered this secret technique, there has, and there's been more than one. However, all of them encountered some miraculous opportunities. Otherwise, their ultimate fates wouldn't have been any different," the man said in a solemn voice.

"So that means those who unintentionally cultivate the Spirit Refinement Technique in the True Immortal Realm will either have to go into hiding or disable this ability altogether," Han Li murmured to himself with furrowed brows.