Immortality and cultivation begin at age forty, starting with Foundation Establishment.

The six-month training period has come to an end.

Chen An and Ye Hongyi both gained a lot.

They brought back a prisoner.

Hidden beneath the rift valley, Fei Yue was originally a woman with a scarred face. However, after peeling off the human skin mask from her face, she turned out to be an extremely beautiful woman.

She must have deliberately put on an ugly mask to adapt to the environment of Qianzhongfeng.

The reason why Fei Yue survived was not because she was beautiful enough, but because she ate the Soul-Slaying Dagger that fell into the rift valley.

That's right, it was one person who consumed a magical artifact.

Moreover, this is a magical artifact that has a restraining effect on the soul. After Fei Yue consumed the Soul-Slaying Dagger, not only was her soul not affected in any way, but an unusual phenomenon was born in her body, allowing the power of the Soul-Slaying Dagger to merge into her soul.

Fei Yue's changes caught the attention of Master Chen An and Yu Mochou.

The Soul-Slaying Dagger is called the Soul-Slaying Dagger because this dagger can penetrate the flesh and directly wound the enemy's soul.

Consume the Soul-Slaying Dagger, and then establish a symbiotic relationship between the Soul-Slaying Dagger and the soul.

Feiyue's actions were simply unbelievable.

After some investigation, Yu Mochou discovered that Feiyue's constitution was suspected to be the legendary Yin-deficient constitution.

A body lacking Yin is a physique that brings good fortune to one's husband in the mortal world, and also a natural furnace physique in the cultivation world. After having intercourse with someone, one will transfer one's own soul power to the person with whom one has intercourse.

Those with a deficiency of Yin will become increasingly weak until they die.

Those who obtain soul power will have their souls nourished and become stronger, just like taking a super medicine, making their cultivation path twice as effective.

Unfortunately, those lacking Yin are rare, because this constitution only exists in the offspring of mortals and is very difficult to detect.

Their spiritual roots are latent, and low-level cultivators cannot even detect their spiritual root aptitude before embarking on the path of cultivation.

Therefore, those with a Yin deficiency will be rejected by the first hurdle in the path of cultivation if they wish to embark on the journey to immortality.

If they are fortunate enough to embark on the path of immortality and their spiritual roots manifest, they will still not be detected as having a body lacking Yin.

It is only when one unknowingly loses their soul power after engaging in dual cultivation with another person and begins to move towards death that such a loss is most likely to be discovered.

If discovered, there are only two outcomes: either they will be drained of their life force by cultivators of the same level, or they will be kept by higher-level cultivators and become their exclusive soul-nourishing furnace.

Another possibility is that Fei Yue subconsciously devoured materials that were harmful to the soul, and she herself displayed some strange phenomena of a soul nature.

It was because of the special material of the Soul-Slaying Dagger that Yu Mochou made the connection to this Yin-deficient body.

Yu Mochou said, "Disciple, your opportunity has come. You and Feiyue cultivated together and absorbed all of her soul power."

"In this way, your path to Foundation Establishment will be much easier, and you will also have a 30% higher chance of condensing a Golden Core in the future."

Chen An never expected that Yu Mochou would tell him about her Yin deficiency.

Logically speaking, Yu Mochou is a member of the Yu family, and she should consider the Yu family when making any decisions. However, Yu Mochou directly told Chen An about her Yin deficiency.

It would be a lie to say I don't want this giant herb shaped like a human, but is it even possible to have it?

"What does Master mean?" Chen An asked, his expression puzzled.

Yu Mochou casually replied, "In the Yu family, the cultivator with the best chance of becoming a Nascent Soul cultivator is Yu Qingchen."

"The fact that Feiyue was sent to the Yu family most likely means she was given to this old man."

"You've met the old man. Although he helped you, he doesn't actually have a good impression of you."

"All the resources of his lineage were given to the younger generation of the family, because he needed someone in the family to support him in forming a Nascent Soul, and the family was also waiting for him to give back after he became a Nascent Soul."

"For the sake of balance and support within the family, Yu Qingchen will not train a disciple like you who is not of the same surname."

"But I'm different."

"Because of what happened back then, the Yu family was utterly disappointed in me. If it weren't for the ancestral precepts that bound me, I wouldn't have been able to condense my Golden Core."

"I need you and Peiyao to grow up quickly."

"I want you and Peiyao to share the power of this furnace."

Chen An understood that it was Yu Peiyao again. With four spiritual roots, what kind of magic did she possess that could make so many members of the Yu family scheme for her?

Smart? Not necessarily.

Through his time with the demon-hunting team, Chen An knew that Yu Peiyao had strong learning and adaptability abilities, but she was definitely not good enough to earn the special attention of the Golden Core cultivators in her family.

The world is not lacking in geniuses, nor is it lacking in hardworking people.

There are plenty of smart, talented, and hardworking people among the younger generation of the Yu family, so she must have other secrets.

The Yu family is a family of weapon refiners.

Yes, the Yu family is a family of weapon crafting experts, so the people they value must be disciples with outstanding talent in weapon crafting.

Chen An recalled the first time he encountered that graceful figure in green on the hillside outside the mission hall.

"Greetings, Senior Brother Chen. I am Yu Peiyao. The disciple token you just received in the mission hall was crafted by me personally."

With four spiritual roots, cultivation progress is slow. However, Yu Peiyao is not only not slow, but she has also cultivated the Refining Spirit Technique, which requires a lot of energy, and has also learned the technique of crafting magical artifacts.

So her talent lies in the art of weapon crafting?

Yu Mochou's next words confirmed Chen An's guess.

"Although Pei Yao's talent is lacking, the magical artifacts she crafts are extremely exquisite. The low-level magical artifacts crafted by the family's Golden Core elders are at most on par with those crafted by Yu Pei Yao."

"If Peiyao is able to condense her golden core in the future, she may very well be able to refine a legendary top-tier natal magic weapon, just like my Yu family's ancestor."

"As long as Pei Yao can cultivate to the peak of Foundation Establishment, both the Yu family and the sect will prepare resources for her to form the Core Formation."

"The probability of forming a core with four spiritual roots is low, but it's not impossible."

Only by cultivating with a cultivator who has surpassed a higher realm can a body lacking Yin ensure its survival and become a stable furnace for cultivation.

The soul power of a person lacking Yin energy at the same cultivation level will continuously transfer to their cultivation partner until their final death.

Feiyue's fate was sealed during the conversation between Yu Mochou and Chen An.

It's not important what Hiizuki decides.

While Chen An and Yu Mochou were chatting, Ye Hongyi was keeping an eye on Fei Yue.

Feiyue gave a seductive smile and said softly, "You don't intend to kill me?"

Ye Hongyi did not respond; she did not know and did not want to respond.

Feiyue said, "Could it be that your Daoist partner has been captivated by my unparalleled beauty and wants me to become your sister?"

"I thought you, with your Heavenly Spiritual Root, were a disciple of a Golden Core cultivator. I never imagined you were just a maidservant on a boat. How interesting."

If you don't say anything, I'll take that as a yes.

"So, what do you say? If your Daoist partner were to take me as a concubine, would I agree or not?"

"Hahaha."

Ye Hongyi's expression remained unchanged. Fei Yue's words could not sway her in the slightest. Her pursuit of the Dao was unwavering, and worldly affairs could hardly affect her.

Otherwise, she wouldn't have willingly become someone else's concubine.

For Ye Hongyi, whether it's being a concubine or practicing dual cultivation, it's just one way for her to explore the path to immortality.