Don't try to cultivate immortality; mortals live longer than immortals.

"Then?"

"And then?" Lingyun glanced at Duan Xuan curiously: "Of course, they will continue to deceive and exploit the newly born resentful demons, just like their predecessors did back then, to seize their benefits."

"These chaotic, cunning, and malicious demonic thoughts—host, do you really expect them to shield the vengeful demons from the rain just because they themselves have been caught in it?"

Duan Xuan: "..."

Well, he admitted he was too naive.

They judged others by their own standards, forgetting that the extraterrestrial demons themselves represent evil.

"So what should we do now?"

"This..." Lingyun sighed, "The environment required for the birth of a vengeful demon is very special. I didn't expect to encounter these guys in this small secret realm. I'm afraid the Immortal Alliance was also taken aback."

"Are these guys really strong?"

Duan Xuan glanced indifferently at the corpse at his feet, his face showing a dismissive expression. Although this guy's strength was also commendable, he was not particularly difficult to deal with. Was it necessary to be so worried?

He felt the system was making a mountain out of a molehill.

As if she could read Duan Xuan's mind, Ling Yun sighed: "Host, you misunderstand. The Vengeful Demon is nothing to fear, at least for you, host, that is for sure."

"After all, the opponent is just a youthful version of the extraterrestrial demon. At most, he is only a temporary worker. After possessing a Qi Refining cultivator, his strength can indeed increase greatly on the original basis, but there is a limit. Facing a cultivator with a true Heavenly Spiritual Root like you, even a few resentful demons are just child's play."

"So you're worried about the other students?"

As Duan Xuan spoke, a hint of worry appeared on his face: "Those participating in this social practice are not from top-tier universities, but mainly from junior colleges. Although they are a year ahead of me, the strength of the students taught by schools such as the Spirit Machinery Repair Vocational Technical College and the Spirit Energy Flying Boat Auto Repair College does make me a little unsure."

"They may have no problem dealing with ordinary Qi Refining cultivators in the Azure Sky Immortal Cultivation World, but once their opponent is possessed by the Resentful Heavenly Demon, the outcome is hard to say."

"Moreover, it's hard to guarantee that they won't be possessed by the demons of resentment."

However, Lingyun shook her head upon hearing this: "The path to immortality is fraught with difficulties, and it is perfectly normal to perish along the way. I am not worried about college students."

"Then you are...?"

"It's very simple. The Vengeful Demons are nothing to fear, but host, don't forget that the reason they launched the surprise attack was because they were bewitched by an extraterrestrial demon that descended here."

"You mean...?"

"Yes, the Vengeful Demon is just a small fry. What I'm really worried about is the wisp of demonic thought hidden behind them. That's the real boss, the formidable enemy."

After listening to the system's explanation, Duan Xuan's face also turned extremely gloomy.

Although he has only just embarked on the path of cultivation, his understanding of extraterrestrial demons is not superficial.

As a great enemy of cultivators, the extraterrestrial demons are described in great detail in an entire chapter of the basic course "Common Sense and Fundamentals of Cultivation".

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That is a being that even the most powerful immortals find troublesome.

For thousands of years, Guixu has been researching how to fight against extraterrestrial demons, and has even developed a specialized discipline based on this research.

Even so, few research results have been able to be applied in practical fields.

Don't misunderstand, it's not that the research of experts and professors has failed to produce practical results. In fact, every year there are a large number of master's and doctoral dissertations on cultivation-related topics that specifically address this issue.

Why didn't it work?

It's very simple; here's an example.

Around 12,000 years ago, a cultivator who had mastered the Void Refinement technique and was also a doctoral supervisor in mathematics discovered a good way to fight against extraterrestrial demons when he combined cultivation with mathematics.

As is well known, the greatest threat that extraterrestrial demons pose to cultivators is when cultivators break through their realms, especially major realms. They will take advantage of the cultivator's weakened state, such as when the cultivator has exhausted their primordial spirit and magical power due to the breakthrough, to either possess the cultivator's body or bewitch them, thus causing them to suffer a qi deviation.

According to AI analysis of numerous cases, when extraterrestrial demons invade, they start with the memories or obsessions of cultivators to find exploitable vulnerabilities.

Then the cultivator who had mastered the Void Refinement technique came up with a method, or rather, conducted an experiment. He was originally a doctoral supervisor in mathematics and was thoroughly familiar with advanced mathematical knowledge such as "Advanced Mathematics," "Calculus," and "Complex Functions."

He had just reached the Great Perfection of the Void Refinement stage and was only one step away from breaking through.

He had no problem with his magical preparations. The only uncertainty was the extraterrestrial demons. He was certain that when he broke through to the Integration Realm, these terrifying demonic thoughts would definitely descend.

An ordinary person would definitely prepare various treasures to deal with demonic thoughts.

However, this expert did nothing but go into seclusion for half a year. During this time, he worked day and night, studying all kinds of complex mathematical problems and relentlessly tackling various difficult problems, which even became an obsession.

This is a very risky experiment!

Obsessed with mathematics, they prepare to use it to fight against the extraterrestrial demons.

Everyone thought he was crazy.

He advised the other party not to take such a risk, as the path to immortality is arduous and cannot be treated so lightly.

But the final result was beyond everyone's expectations. He successfully broke through to the Fusion stage, but it was extremely difficult, and he had very little magic power and divine sense left.

As expected, the extraterrestrial demons took advantage of the situation and invaded. Under these circumstances, it would be difficult for him to resist, and he would almost certainly perish under the demons' attack.

However, something unexpected happened.

The extraterrestrial demon entered his sea of ​​consciousness and successfully found the big boss's obsession.

The result wasn't about mundane matters, love, hate, or grudges. There was no reminiscence of a lost love, nor any lingering resentment towards former enemies. All that remained was an endless array of mathematical problems.

Functional analysis, Riemannian geometry, and advanced mathematics and calculus are all child's play compared to it.

Extraterrestrial Demon: "..."

The extraterrestrial demons were dumbfounded.

What are all these things in front of me?

It completely exceeded his understanding and expectations.

Originally intending to take advantage of the situation and cause this newly promoted Nascent Soul cultivator to suffer a qi deviation, he died before he could even begin. Before he could bewitch the other party, he himself was overwhelmed with all sorts of profound mathematical problems.

Because he entered into the other person's obsession.

In this situation, it's impossible to ignore these math problems, because they are the rules of heaven and earth, just like action and reaction. When extraterrestrial demons use their obsessions to invade cultivators, the images within those obsessions will uncontrollably backfire on them.

Other obsessions were already well-versed in by the extraterrestrial demons; love, hate, and grudges were all great tonics for them, and controlling people's hearts was merely a basic operation.

But math problems...