Immortal indeed! Immortals must possess an abundance of advanced martial arts and countless treasures. Lin Yifan felt that he had struck it rich this time and resolved to ingratiate himself with the Immortal.

"Exactly. Back then, I burnt my divine power to perish together with it, not realizing that the demon's soul wasn't completely destroyed, which almost allowed it to escape. Being on my last legs at the time, I had no choice but to suppress the demon with my blood and my Cave Mansion," answered the elderly Immortal.

"So that's how it was," Lin Yifan suddenly realized, then followed up with a question, "Grandpa, there's still one thing you haven't answered me, are there treasures inside the Cave Mansion?"

"Hehe! Don't be anxious. What's yours won't escape you," the elderly Immortal replied.

"Grandpa, why do you say so? Could it be you anticipated my arrival long ago? Are the treasures in your Cave Mansion all prepared for me?" Lin Yifan was somewhat surprised, not expecting such an outcome.

Various signs indicated that the elderly Immortal surely had something to tell him, or else he wouldn't have suddenly appeared.

"Since I was on my last legs at the time and could not kill the weakened evil spirit of the demon, I divined before my impending demise to see if anyone in the future would fulfill my wish and eradicate this scourge upon humanity. The prophecy showed that after several hundred thousand years, a young man in his twenties would come to the cave and kill the demon. Now, I have finally waited for you to come," he said.

"Before my death, I declared that whoever could kill this demon's evil spirit could inherit my mantle and become my successor, the heir of the Qingxu Immortal. Therefore, all the treasures in my Cave Mansion are yours, along with all my life's learnings," the Qingxu Immortal answered.

"Really?"

Lin Yifan felt incredibly flattered and hardly dared to believe it was true. This unexpected surprise thrilled him beyond measure, for he had not anticipated such a generous reward for his kind intentions.

"Mmm! I, the Qingxu Immortal, never lie," Qingxu Immortal replied.

"Aren't you afraid that I might be a bad person?" Lin Yifan asked curiously.

Giving away such wealth unconditionally to one person—if he met a bad one—then chaos would reign in the world. Thus, he was curious as to why the Qingxu Immortal trusted him so much.

"Anyone daring enough to enter and kill this evil spirit, no matter how bad, couldn't be all that bad. Moreover, I believe the divination I performed was incredibly accurate, and you must be a warm-hearted young man," the Qingxu Immortal replied confidently.

"Alright then! In that case, I will humbly accept becoming your heir," Lin Yifan said, feigning reluctance on the surface while secretly overjoyed in his heart.

If he received the true teachings of the Qingxu Immortal, his ascent to becoming the strongest was but a matter of time.

"Hehe! You sure don't lack ambition. Back then, many a hero yearned to take me as their master but were mercilessly turned away at the door; so, you've stumbled upon a treasure today," the Qingxu Immortal chuckled coldly, feeling that Lin Yifan, this young man, was far too impolite.

Although he had declared that he would pass on all his learnings to the young man who would kill the demon's evil spirit, if Lin Yifan continued with such a haughty attitude, he would renounce his promise, close the gates of the Cave Mansion, and forever bury the treasures within the earth.

"Right, right, right! Master, I was disrespectful just now, please forgive me!" Lin Yifan hastily apologized and admitted his error.

The Qingxu Immortal seemed rather displeased, and if in a bout of anger, he were to close the Cave Mansion's gate and vanish, Lin Yifan's loss would be colossal. Such an event would be a tremendous blow to his cultivation journey, so he dared not act arrogantly anymore.

"Humph! That's more like it," Qingxu Immortal snorted and then imparted all his life's learnings to Lin Yifan.

Even though Lin Yifan had been somewhat arrogant, his heart was still kind; and noticing Lin Yifan's exceptional martial potential, the Immortal realized he would achieve great things in his cultivation. It was for this reason that he chose to pass on his life's teachings to Lin Yifan.

"Close your eyes, relax your body, I will now impart to you all that I have learned in my life," Qingxu Immortal instructed.

Lin Yifan did not waste any words and immediately did as Qingxu Immortal had said.

After a while, when Lin Yifan was ready, Qingxu Immortal cast a beam of white light that struck Lin Yifan's forehead, attempting to transmit his lifetime of knowledge to Lin Yifan.

However, at that moment, his white light was obstructed.

"Young man, your soul has been bound by someone, did you know that?" Qingxu Immortal slowly opened his mouth to ask.

Just now, his white light had hit a prohibition and was unable to enter Lin Yifan's mind.

"Bound by someone? Who could have done it? Was it the Demon Mountain God? But I have already killed it," Lin Yifan asked curiously, extremely puzzled.

"It's not that devil who bound it; there is someone else. Think back, before this, has anyone touched your forehead?" Qingxu Immortal reminded.

"Who has touched my forehead?" Lin Yifan thought for a moment, and soon a person popped into his mind.

"It was him! But why would he bind my soul?" Lin Yifan's face was full of questions, completely baffled.

It was as if his own kin had betrayed him; why would he do something like that?

"Who is he?" Qingxu Immortal asked curiously.

"He is my master. When I took him as my master, he drew a few strokes on my forehead. He said it was the mark of Medicinal Saint Valley, and that each disciple of the Valley had one," Lin Yifan answered.

"A mark? Ha! Fool, it's a fatal soul prohibition! With just a slight thought from his mind, your soul will disperse, and you will vanish completely from this world," Qingxu Immortal informed with a cold laugh, finding Lin Yifan incredibly naive, like a lab rat.

"So malicious?" Lin Yifan's face was full of shock; he hadn't expected this outcome.

Had he not met Qingxu Immortal today, he would have remained in the dark.

However, he only had himself to blame. Before becoming a disciple, the Bright True Master had already cautioned him that to become his disciple, he must have this mark. There was no coercion involved; it was Lin Yifan's own choice to rush into danger.

Now that he knew the truth, he felt regretful; had he not been so greedy, his life might not have ended up in someone else's control, subject to their dominion.

But there was one thing he still didn't understand, so he asked, "If it's a soul prohibition, then why was the demon's evil spirit able to easily enter my mind?"

"Because the demon's evil spirit is an extremely powerful being capable of ignoring weaker prohibitions and breaking into your mind," Qingxu Immortal answered.

"I see, so the demon's evil spirit is that abnormal, to be able to disregard a soul prohibition laid by a True Master Five Realm Peak expert," Lin Yifan said in astonishment, realizing the unexpected truth of the matter.

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