A technologically powerful nation: The national treasure is actually myself.

Yueyou did not answer the ghost's question, but said coldly:

"You should go back to your underworld."

The ghostly aura around it intensified, and its voice remained equally chilling:

"You lost soul from ancient times, though I don't know how you manage to still be full of life in this day and age, it's not your place to interfere in my affairs. You want to save people? Then let me test whether you, an old person from ancient times, are qualified!"

Yueyou's expression was indifferent: "Old man, the boundary rules haven't been broken yet. Are you sure you want to fight me?"

"Heh, I'd like to see if you truly possess abundant energy, or if it's all just for show!"

The ghost chuckled softly and said no more. Its immense, chilling power swept towards Yueyou like a storm.

Yueyou's expression remained unchanged. With a wave of her hand, the immense, chilling power melted away like winter snow meeting spring.

An indescribable aura emanated from its body, pressing back against the Yin spirit.

The ghost's body trembled, and the mist enveloping it transformed into countless gusts of cold wind, howling towards Yueyou.

The two forces collided, and the heavens and earth seemed to tremble.

"Hmm? Your power is actually real?"

After this attack, the ghost was clearly somewhat surprised.

He could already sense that Yueyou's power was not superficial.

Yueyou remained indifferent: "Your power has almost fully recovered. Are you sure you want to continue?"

The ghostly spirit said in a low voice, "I'm determined to have this boy's body."

"Is that so?" Yueyou said calmly. "That's unfortunate, I've already secured his protection. If you want to continue, then let's have a fight. But you need to think it through. If you fight me now, you might not be able to control things in the underworld. At that time, someone might go against the current or go with the current and cross over to kill you."

The ghostly gaze was cold: "Your power, though not weak, is certainly not in its normal state. I believe it won't take long to deal with you."

"Is that so? Then you can try. You can take a gamble and see if you deal with me first, or get dealt with first," Yue You said calmly.

The ghost fell silent upon hearing this, seemingly lost in thought.

Looking at the ghostly appearance, Yueyou said again, "I'll give you ten breaths to consider whether to go back or fight now."

A cold glint immediately flashed in the ghost's eyes: "To deal with you, I don't need to go beyond my limits."

"Then let's cut to the chase and get started," Yue You said calmly, emanating an aura that seemed capable of tearing everything apart.

The space around her began to distort and break apart.

An ancient, rustic aura, seemingly out of place in this era, slowly emerged.

It's as if the power of ancient times is being revived.

The earth and sky trembled, as if shaking.

Seeing this, the mist surrounding the ghost trembled again, and suddenly spoke:

"Very well, I underestimated you. A lost soul from an ancient era, yet you have managed to revive your power in the present world. I will remember what happened today, and I will seek you out when the world's rules are broken."

Having said that, the ghostly figure began to slowly dissipate, not intending to actually fight Yueyou, and prepared to leave.

However, Yueyou said coldly, "It's a bit too late to leave now."

With these words, a portion of the power that had been revived moved toward enveloping the vengeful spirits.

The ghostly voice turned cold: "Do you want to cut off your own path? Using your superhuman power now will do you no good!"

"You don't need to worry about that," Yueyou said calmly. "Didn't you just say you wanted to test me? I also want to see how much power an old thing like you still has left."

The ghostly spirit was instantly enraged: "Damn you, lost soul from the past! If I had more time, I could have suppressed you with a mere flick of my wrist!"

However, even as he said these words, his figure disappeared even faster.

Clearly, he genuinely did not want to fight Yueyou.

hum.

However, Yueyou seemed to have made up her mind. She raised her delicate hand, gathering boundless power in her palm, and slapped it towards the body of the Yin spirit.

puff!
With a muffled thud, Yueyou's power merged into the Yin Soul's body, causing the latter's body to shudder violently before disappearing even faster, turning into wisps of mist that drifted into the void.

At the same time, all the cold, sinister power dissipated in an instant.

Only the angry roar of the ghost echoed:

"Damn Lost One, I'll remember you!"

"..."

As the vengeful spirits vanished completely, peace returned to the land, and sunlight once again bathed the area in its warmth.

Lin Yang has also fully recovered.

He looked at Yue You and said gratefully, "Thank you for saving me, senior!"

If Yueyou hadn't suddenly appeared, he would have been in grave danger.

Yueyou waved her hand, glanced at him, and said:

"That old man's power recovered too quickly. If I hadn't estimated that you should have arrived at your destination long ago, but you haven't arrived yet, and I didn't feel something was wrong, so I checked this way, I really wouldn't have found out that something happened to you."

Lin Yang gave a wry smile: "Luckily, senior discovered it, otherwise I'm afraid I would have really been controlled by that evil spirit."

Yueyou looked at him thoughtfully and said:

"I was quite surprised that you could hold on for so long, but that's not important. What's important is that the old man won't give up on you easily. If he goes back this time and reappears, it will probably be very difficult to deal with him."

Lin Yang's heart sank: "Senior Yueyou, why did that ghost choose me?"

He had asked the spirit this question before, but the spirit did not answer.

Perhaps Yueyou knows something.

Yueyou sighed softly: "It's a long story, and there are some things I can't tell you right now, so I'll keep it short."

Lin Yang immediately listened attentively.

Yueyou said slowly:
"The underworld is a special place. There are actually many spirits in it. Almost none of them have physical bodies. They are sealed there. If a spirit wants to leave the underworld, the rules of the underworld will collapse. Otherwise, if it wants to stay in the normal world for a long time, it needs a physical body as a vessel."

"And the physical body is not just any one; it must be compatible with the spirit itself. Especially in the later era, with the restrictions of the boundary rules, the spirit is even less able to actively descend into the normal world to choose a vessel."

"The reason that old man chose you is probably because you used the spirit communication array. Theoretically, spirit communication arrays should be something that was lost in later eras, but you obtained it and used it, bringing the mortal world and the underworld together again." "That old man sensed this and branded you after you used the spirit communication array. Due to the restrictions of the realm rules, he basically couldn't look for anyone else. In addition, you might really fit his requirements, so he set his sights on you."

After hearing this, Lin Yang frowned, and many doubts arose in his mind.

He paused, then asked a few questions:
"Senior Yueyou, that Yin spirit is so powerful, can't it reshape its physical body? Also, it has said more than once that the boundary rules are about to expire. Does this mean that the boundary rules will become invalid when the time comes? If so, will the Yin spirit be able to appear at will?"

Yueyou nodded slightly: "That's right, there is indeed a problem with the boundary rules, but there's no need to worry too much. Those people should have a backup plan. As for reshaping the physical body, there are many things involved, and I can't explain it to you in a short time. You will naturally understand why even a powerful Yin spirit cannot reshape its physical body at will in the future."

Lin Yang remained silent for a moment, then asked, "Senior Yueyou, were the boundary rules man-made? Is someone deliberately restricting the appearance of Yin spirits?"

He had actually been wondering about this for a long time.

Because, judging from various details, the boundary rules do not seem to be a rule formed naturally by heaven and earth, but rather more like a confrontation between two parties.

One is a normal person, the other is a ghost.

It seems that the normal cultivators created boundary rules to restrict the wandering spirits.

That's the only thing he couldn't be sure about.

Yueyou gave an affirmative answer to this question:

"You guessed right, the boundary rules were indeed man-made, and their purpose was to restrict the spirits."

"It really is a rule made by humans?" Lin Yang was greatly surprised.

What kind of being could establish such a rule that even that ghost cannot break?
Moreover, if such powerful rules can be established, why not just eliminate the spirits directly?
Yueyou seemed to have read his mind and slowly said:
"Lin Yang, if your cultivation improves further, you will be qualified to know many things."

"Isn't the Eternal Realm enough to know?" Lin Yang murmured.

“Although the Eternal Realm is strong, it’s still not enough.” Yue You shook her head.

"What realm did you reach? Was it the Ancient Realm?" Lin Yang pressed.

"More or less. Once you reach the Ancient Realm, you'll know many things, but you'll also face some choices then," Yueyou said, a complex look flashing in her eyes.

Lin Yang keenly noticed this and couldn't help but ask, "Is it a difficult decision to make?"

"I guess so," Yueyou said without elaborating.

Lin Yang already knew what was going on.

"Alright, let's not talk about that now. I called you here because I have something to discuss. Come with me." Yueyou changed the subject and flew towards the Endless Sea.

Lin Yang followed behind, pondering many things, before finally asking, "Senior Yueyou, what would be the consequences if the boundary rules were broken, allowing Yin spirits to appear in the normal world?"

Yueyou's voice drifted on the wind: "The consequences are simple: most cultivators will be killed by the Yin spirits."

Lin Yang paused, then asked, "What exactly are those vengeful spirits? Are they products of the dead? I mean, are they what ordinary people think of as ghosts or something similar?"

Yueyou turned and glanced at him, saying, "In this world, there are no ghosts in that sense. Yin spirits are not ghosts; there are two types."

"The first type is a product born under the rules of the underworld. Initially, they have very low intelligence, survive by killing on instinct, and then grow little by little. In most cases, these kinds of spirits are relatively easy to deal with."

"The second type is the spirit that is transformed by the cultivator himself."

Lin Yang was shocked: "Self-transformation? There are people who turn themselves into ghosts?"

Yueyou nodded: "In the distant past, the Underworld was a very special place. It had its own set of power rules and was connected to the normal world through a passage."

"Under that power rule, the lifespan of Yin spirits can be greatly extended. Therefore, many cultivators with limited lifespans or no hope for the future would go to the Yin realm on their own to transform themselves into Yin spirits in order to gain more lifespan."

"Although there are many drawbacks to transforming into a ghost, such as being gradually driven away and rejected by the rules of the normal world, and being eroded and polluted by the power rules of the underworld."

"But when faced with the temptation of lifespan, these drawbacks are nothing, especially since there are some supreme experts who can even resist the erosion of the rules of the underworld."

"So during that period, there were many ghosts who transformed themselves."

"Later, the corrosive power of the rules of the underworld also gradually became apparent."

"The corrupted spirits will inevitably develop a murderous intent towards the living, and this murderous intent will become an instinct."

"Therefore, a great war broke out later, and some powerful beings in the normal world used their great supernatural powers to sever the connection between the underworld and the normal world."

"However, the power and rules of the underworld are very strong and strange, and can constantly seep out."

"Some practitioners, when facing death, can still transform themselves into a spirit through the rules that seep out from the underworld, thus entering the underworld and avoiding complete death."

"The power rules of the underworld also absorb the remaining obsessions of some cultivators after their death, transforming them into a special existence similar to a ghost."

"Anyway, over a considerable period of time, the number of spirits in the underworld increased and grew quite large, and many wars broke out between the spirits and normal cultivators."

“Wraiths can use the special rules of the underworld to invade the normal world.”

"Over time, until a certain era, some extraordinary figures emerged who completely separated the underworld from the normal world and even created boundary rules to suppress the underworld and its spirits."

"But the spirits have never given up on breaking the boundary rules. Some spirits even want to return to the normal world. In addition, some changes occurred later, and loopholes appeared in the boundary rules. Today, the boundary rules are about to be completely broken."

Yueyou said a lot in one breath.

Lin Yang was quite surprised to hear this.

He always felt that there were many secrets hidden in this.

But for a while, I couldn't figure things out.

"Alright, Lin Yang, don't overthink it. There are some things you won't be able to avoid knowing once you've reached a certain level of strength."

Yueyou spoke, bringing Lin Yang back to his senses. Pointing to the boundless, endless sea, she said:
“I have also discovered an entrance to the Ancient Origin Void Domain here. Things are different now than before. This time, we are sure to have a great harvest. If all goes well, it will at least allow you to step into the Unknown Realm.”

Lin Yang was taken aback: "The Ancient Domain of Origin Void?"

He recognized the name somewhat.

A moment later, he remembered that it was the desolate world connected to the cemetery he had entered in the Heart of the Extreme Sea.

At that time, Yueyou referred to that place as the Origin Void Ancient Domain.

"Senior Yueyou, are we going to that space where the tomb complex is located again?" Lin Yang couldn't help but ask.

Yueyou nodded: "That's right. Last time I asked you for gloves and beads, which are used to open the entrance."

"So, are we going to rob graves again this time?" Lin Yang blurted out.

Yueyou's eyes immediately turned strange: "What tomb raiding? Don't put it so harshly, this is archaeology! Don't you understand archaeology?" (End of Chapter)