Mortal: I became invincible after becoming sworn brothers with Han Li.

The female demon swam ahead, constantly introducing this magical treasure to Li Yunfan.

"This magical treasure of our clan's grotto-heaven was left behind by our ancestors. Although the entire grotto-heaven is only a little over ten miles in size, it contains not only a forest of starstone trees and this lake, but also a mountain range several miles long, located at the northernmost part of this space. To ensure that the spiritual energy within the grotto-heaven was abundant, our ancestors specifically sought out a large piece of spirit eye stone; otherwise, after so many years, the spiritual energy inside would have long since dried up..."

Upon hearing this, Li Yunfan's heart stirred. No wonder the spiritual energy in this cave was so abundant, allowing a large number of star stone trees to survive. It turned out that there was a spiritual eye stone there.

Although the Spirit Eye Stone is only the lowest grade of Spirit Eye item and its effect is far less powerful than the Spirit Eye Jade, it is still a Spirit Eye item after all. The spiritual power it emits can still support this cave world of more than ten miles without any problem.

However, this also made Li Yunfan even more curious about the cultivation level of the ancestors of the Hanchi clan, and also why the Hanchi clan went underground to live tens of thousands of years ago...

"...It's a pity that since our clan moved underground, no one has been able to reach the Nascent Soul stage, so this treasure has remained unrefined. Otherwise, if we could just put all our clansmen into the Blood Crystal, we could bring them all to live on the surface."

As the female demon spoke, she suddenly let out a long sigh, seemingly feeling utterly helpless about the situation.

"Senior, there's no need to be so pessimistic. The Hanchi clan lives underground, which may be better for them than returning to the surface. Haven't these tens of thousands of years proven this well? If they were to return to the surface, with the Hanchi clan's current strength, they would probably be in trouble if they encountered a Nascent Soul cultivator..." Li Yunfan paused for a moment before suddenly speaking.

After hearing Li Yunfan's words, the female demon turned around and glanced at him before speaking again.

"You're right. It's precisely because no Nascent Soul cultivator has appeared in our clan that we've been living underground. But this situation won't last much longer. Once I have that thing, I'll be able to enter the Nascent Soul realm soon!" As the female demon finished speaking, a glint of light flashed in her eyes, and her face was full of confidence.

Li Yunfan frowned slightly. Judging from what the other party said, the thing he was about to retrieve seemed to be a treasure that could help her break through to the Nascent Soul stage.

Thoughts flashed through his mind, and Li Yunfan immediately asked, "Senior, I have a question, and I wonder if you could answer it for me?"

The female demon said without turning her head, "Ask away."

"Since the item you asked me to retrieve is a treasure of the Hanchi clan, why did you set up a Blood Soul Restriction to prevent your clansmen from entering?"

"I don't know the specifics, but the items inside are indeed treasures of my clan, always kept on the third level of the Cave Heaven Divine Palace. Once a member of the Hanchi clan steps into the third level, their blood and qi immediately surge, and they suffer from incessant headaches. If they force their way forward, they will be crushed to death by the Blood Soul Restriction. Otherwise, countless Nascent Soul cultivators would have been born in my clan long ago!"

Upon hearing this, Li Yunfan simply nodded slightly, then fell silent, focusing intently on following the female demon along the lakeside.

Seeing that Li Yunfan had only asked one question and then remained silent, a hint of doubt flashed in the eyes of the female demon. After thinking for a moment, she directly asked the question that Li Yunfan most wanted to know.

Are you very curious about our Hanchi clan?

Li Yunfan was taken aback for a moment upon hearing this, then immediately seized the opportunity and said, "Unfortunately, senior, this junior is indeed very curious!"

He wasn't lying; how could he not be curious about the Hanchi clan, who had lived underground for tens of thousands of years?

The female demon chuckled and said, "I'm glad you can admit it. Actually, I don't know much either. Some of it I only learned by going to the temple to look through the ancestral records while you were recuperating. Now I'll take this opportunity to tell you some of it."

After pausing for a moment, seemingly to organize his thoughts, he slowly began to recount what he knew.

Of course, these are all trivial matters. She would never tell Li Yunfan the real secrets of the clan, at least not now.

After hearing the explanation from the female Hanchi, Li Yunfan finally gained a seven or eight percent understanding of the Hanchi clan.

First of all, like other demonic beasts, the Frost Demons have a very long lifespan. A normal, ordinary Frost Demon, if they do not die unexpectedly, has a lifespan equivalent to that of a Core Formation cultivator.

Those who successfully cultivate will have their lifespan multiply. A Foundation Establishment cultivator can have a lifespan of a thousand years, comparable to a Nascent Soul cultivator. A Core Formation cultivator can have a lifespan of nearly two thousand years, and if they reach the Nascent Soul stage, they can live a terrifying five thousand years!

Upon hearing this, Li Yunfan finally couldn't resist asking the mother and daughter their ages, and the result almost made him bite his tongue.

This female cold demon, who is at the Core Formation stage, is now over 1,200 years old, while the female cold demon named Bing'er is nearly 200 years old!

This made Li Yunfan afraid to look directly at the female Han Chi beside him. Although she looked young and even somewhat cute, in terms of age, she could be his great-grandmother...

Secondly, cultivation is extremely slow for the Hanchi clan. Under normal circumstances, a Hanchi member may not even reach the Foundation Establishment stage in their entire life.

However, through diligent research, the ancestors of the Han Chi clan actually discovered a special secret technique that allowed them to rapidly improve their cultivation. However, this method was not only extremely dangerous, but also required a long period of preparation before it could be provided to a single member of the clan for practice.

Therefore, this secret technique was only used a few times before being sealed away. It wasn't until their clan went deep underground that they restarted the secret technique to ensure that a high-level cultivator was always present.

This Core Formation female demon, Han Chi, relied on this secret technique to cultivate to the late Core Formation stage.

Finally, the Cold Demon clan has a very special constitution. Their bodies constantly generate extremely cold energy, which can increase their strength, but they must dissipate the cold energy every once in a while, otherwise they will freeze themselves due to too much cold energy.

This is also why the female demon Bing'er jumped into the cold pool. The extreme cold can only be gradually dissolved in water. If it were to spread on the ground, the cold would still freeze them into ice.

Even at the Core Formation stage, one still needs to release cold energy. Only after advancing to the Nascent Soul stage can this cold energy become a great help, assisting in cultivation and also being released to attack enemies.

As for why they entered the underground tens of thousands of years ago, Nü Han Chi still did not explain, only saying that there was no record of it in the temple.

Whether she genuinely didn't know or simply didn't want to say, remains unknown.