Naruto: Starting with the Two Kamui

At this point, Uhichir touched his forehead with his hand: "As for the fifth Rinnegan on my forehead, it is hidden in the bloodline of the main family members. It can only be activated when it is touched by the power of the Divine Tree, or when it absorbs a large amount of chakra in a short period of time and triggers the 'transformation state'."

Ubiquitous narrowed his eyes slightly: "However, there are a very small number of people in our clan who, like me, can activate their transformation state through their own power. You will probably encounter them in the future."

Yu suddenly realized, "So that's how it is."

Ubichi lowered his hand from his forehead and solemnly said, "Then, let's begin our first training session. I will teach you—'Netherworld Immortal Mode'!"

Chapter 672 The Feast of Avici Hell, Netherworld Immortal Techniques!

Yu asked, completely bewildered, "Netherworld Immortal Mode? What's that?"

Uhiddle's teaching style, like his personality, was gentle and unhurried. Instead of explaining directly, he traced the origins back to the basics: "Before that, let's review the concepts of 'chakra' and 'sage techniques' once again~"

Yubidi sat on the ground.

"First of all, a person's chakra is a balance built from 'physical energy' and 'spiritual energy'."

Yu sat down in front of him: "This is common knowledge that's taught at the Ninja Academy~."

Yu Bidi nodded: "The three great immortal families are the origin of all immortal arts. Their principle is to break the original balance, introduce variables of natural energy, and establish a new balance."

"However, the balance established by the Ryuchi Cave Sage Technique is based on physical energy, the balance established by the Shikkotsu Forest Sage Technique is based on spiritual energy, while the balance established by Mount Myōboku is based on natural energy."

"The essence of the Free Immortal Technique, which combines all three, is to greatly enhance physical and mental energy, and then create a new balance with natural energy. Therefore, it is exceptionally powerful, and the amount of natural energy it introduces is enormous!"

"But whether one cultivates a single method or a combination of methods, there are only three variables in traditional immortal arts: physical energy, spiritual energy, and natural energy!"

"The qualitative change only began with the 'Six Paths Sage Techniques,' because the fourth major variable, the 'Ten-Tails' power,' was added, and a new balance was established by the four elements..."

After laying the groundwork, Ubiquitous got down to business: "Alright... next, we can talk about Netherworld Immortal Arts!"

Yu sat upright, listening attentively.

Yu Bidier said, "The Netherworld Immortal Technique was created by Yama of the Underworld, 'Kyushaha Yutanbhara.' Many years ago, after his soul arrived in the Underworld, he discovered the magical power nurtured there... It is quite similar to the power of nature, but they cannot be generalized. Therefore, Yutanbhara named this magical power 'Netherworld Power.'"

“Yodan-boro also visited the sacred sites of the three great immortal families in Takamagahara during his lifetime, and cultivated all three, thus mastering the art of free immortality.”

"Inspired by this, You Tan Po Luo imitated the traditional immortal technique of absorbing the power of nature with the body and created the first method of absorbing the power of the underworld with the soul. Thus... the Netherworld Immortal Technique was born!"

Yu Xin was filled with longing: "Absorbing the power of the Netherworld with one's 'soul'?"

Ubidi laughed and said, "Yes, the power of the underworld is a unique power of the afterlife. It cannot be perceived or received by the body; only the soul can!"

Yu gazed at his hands and murmured, "A soul..."

Uhichiro's gaze was intense as he said, "You have already mastered the Six Paths Sage Techniques. If you were to learn the Netherworld Sage Techniques on top of that, the chakra within you would introduce a fifth variable, 'Netherworld Power,' in addition to 'physical energy,' 'spiritual energy,' 'natural energy,' and 'Ten-Tails Power.' The five elements would establish a new balance, creating a completely new realm!"

The fifth variable, a new field, is incredibly exciting just to think about!

Yu stood up and said, "Teacher, please teach me the 'Netherworld Immortal Technique'!"

“Hmm~” Ubiquitous nodded and smiled, standing up gracefully: “Just like when you were learning traditional immortal arts, to absorb the power of the Netherworld, you must first learn how to perceive the power of the Netherworld. However, this time the medium is not the body, but the ‘soul’.”

"Tobirama Senju deserves a lot of credit for this! Including Hagoromo (the Sage of Six Paths) and myself, we all learned the art of soul manipulation after death, but Tobirama, in his human form, developed 'soul ninjutsu,' which is called... 'Spirit Transformation Technique,' I mean?"

“Yes, it’s called Spirit Transformation Technique.” Yu nodded.

Ubidear exclaimed, "What a remarkable invention! I know you've also mastered the Spirit Transformation Technique. With this technique, your study of Netherworld Immortal Arts will be much easier. Now, use the Spirit Transformation Technique to let your soul leave your body!"

Yu asked, "Does entering the Netherworld Immortal Mode always require the soul to leave the body first?"

Ubi-Dier shook his head and said, "No need, but beginners who want to perceive the power of the underworld should first break free from the constraints of the body and be in a pure soul state. It is easier to find the knack. Once you find the knack and master it, there is no need to do this again."

"I see."

Yu sat down on the ground, closed his eyes, and formed the hand seals for the 'Spirit Transformation Technique'!

call out!

A blue light burst forth from its body, transforming into the shape of feathers!

The Spirit Transformation Technique is not simply 'soul leaving the body,' but rather the chakra of the body is stored in the soul, so the soul can be manipulated to kill enemies, making it a very terrifying technique... The strategic nature of this technique was brought to its full potential by Tsunade's former lover, 'Kato Dan.'

Ubiquitous looked up at the soul floating in the sky and asked, "How do you feel?"

Yu's soul gazed in a certain direction: "This is a bit strange..."

Ubiji looked up and thought: That's where the River Styx is. The power of the underworld there is indeed strong... He sensed it so quickly? It seems that he has laid a good foundation while learning traditional immortal arts. He will probably master it soon.

Ubidi said, "In your Spirit Transformation state, you can travel anywhere regardless of distance. But remember, don't let yourself go into the River Styx. Before you truly master the power of the Netherworld, you don't have the resistance to the River Styx..."

"Understood... Ubichi-sensei."

Whoosh! Yu's soul transformed into light and soared towards the horizon.

Yu Bidi smiled slightly and stayed by Yu's side without leaving her side. If Yu's soul encountered any danger, she would forcefully summon it back into her body.

Several days later...

Yu's soul flew back on its own, bringing good news: "Teacher, I have found the key to sensing the power of the netherworld!"

Ubiquitous opened his eyes and said with satisfaction, "Not bad, even faster than I expected..."

Yu's soul asked impatiently, "Then, how do I absorb the power of the Netherworld into my body? Do I also need to meditate?"

Ubiquitous nodded and said, "Meditation is required... but before learning the method of meditation, you need to gradually adapt your body to the power of the Netherworld. I have already prepared the necessary items for you."

Looking at the 'clothes' laid out before him, Yu's soul was surprised: "A yukata?"

Ubiji said, “This is ‘Yamimitsuha’, the same as the shroud you wear when you go to hell, but it has a different purpose. This one is for cleansing the body, that is, bathing. It does not completely isolate the power of the underworld like the shroud, but rather acts as a filter.”

"Put it on and soak in the hot spring in front of my hut. The water there is purified from the River Styx and contains a certain amount of Netherworld power..."

"I understand."

Yu's soul donned the 'Dark Feather' and came to soak in the hot spring.

Whoosh! The door swung open.

"Hmm?" Madara, supporting Hashirama who had just woken up, frowned and said, "Obito, why are you soaking in a hot spring while using Spirit Transformation Jutsu?"

Chapter 673 The Feast at Avici Hell is Getting Better!

Yu did not respond to Ban, because he was completely absorbed in comprehending the new power!

The ghostly power in the hot spring, filtered by Yami Mitsuha, entered Yu's soul in a amount that would not harm it!

hum!

Yu's soul emitted a faint silvery-white light, and new changes were subtly taking place.

"Hmm?" Madara noticed something amiss: "This is the strange feeling I had when I entered Sage Mode on the River Styx."

"It seems he has already begun to adapt to the power of the Netherworld. We can try increasing the dosage."

Ubiji walked gracefully over, gently raising her hand. The Dark Feather worn by Yu's soul became thinner, allowing more Netherworld power to seep into her soul.

"Ugh!" Yu's soul let out a muffled groan, becoming scalding hot and rising with scorching wisps of smoke... Although he suffered some damage, it was not beyond repair. Yu endured it, and after passing a certain critical point, he adapted once again!

call out!call out!

Looking at Yu, who was enveloped in a silvery-white aura, Uhiddle nodded with satisfaction. He then turned to look at Hashirama, who was being supported by Madara, and asked, "You're awake. How are you feeling?"

Hashirama gave a bitter laugh: "Don't even mention it, I feel like my body isn't whole anymore..."

The worst thing is comparison. Only after experiencing the Infinite Tsukuyomi of hell can one truly appreciate the wonder of Kaguya's Infinite Tsukuyomi...

Kaguya's Infinite Tsukuyomi allows you to transform into a White Zetsu without pain while you are in a beautiful dream, while in Hell's Infinite Tsukuyomi, you will experience with unparalleled realism the feeling of your body being ground into minced meat and your soul being fried in a pot of oil!

Ubiquitous said in a deep voice, "If that's all there is to it, you're still lucky."

"Perhaps," Hashirama responded, then asked, "What is Xiaoyu doing?"

Yubiji said, "He was chosen by Yama as the Soul Chaser, and I am currently in charge of guiding his cultivation."

"The Soul Chaser...?" Madara and Hashirama were both surprised.

Uhiddle explained the duties of the Hell Chaser, emphasizing, "Hashirama, I hope you understand that he took this job so that you could be pardoned..."

"..." Hashirama felt deeply guilty. After a long while, he asked, "Will the Hell Chaser be in mortal danger?"

“There won’t be any danger to his life…” Yubiji shook his head and said with a complicated expression, “But… what will be more cruel than the danger to his life is the torment in his heart. Sooner or later, he will understand.”

Over the next few days, Yu continued his training to adapt to the power of the Netherworld. His clothes gradually loosened until... he could soak in the hot spring without wearing the Dark Feather. Ubiji put an even thicker Dark Feather on Yu!

Then, with a wave of his hand, he said, "Put on the Dark Feather and go swimming downstream in the River Styx. Once you can swim naked in the River Styx, I will teach you the method of meditation!"

Day after day, half a year has passed in this world.

In the underworld, Yu was finally able to move freely in the River Styx, naked!

This is a matter of personal qualities, not skills... It requires a lot of time to train, there's no other way.

Then... Ubiji taught Yu the meditation method of the Netherworld Sage Mode!

Yu actively absorbed the power of the Netherworld into his soul... In terms of technique, Yu had already accumulated a lot of experience while cultivating traditional immortal arts, and quickly mastered it!

After completing the meditation, Yu's soul was enveloped in a layer of holy white light.

Yu Bidi nodded secretly: He succeeded on the first try. His valuable past experience played a decisive role, especially the mental cultivation he underwent while learning the Silent Immortal Technique. He had been through countless battles and walked on the edge of life and death several times, which made it all possible!

Ubiquitous said in a clear voice, "Now, dispel the spirit transformation technique and let your soul return to your body!"

boom!

The moment the soul returned, the power of the netherworld entered the body.

Snap! Snap! Snap!

The Truth-Seeking Balls floating behind Yu completely disintegrated into powder...

It turns out that this was caused by the collapse of the balance between the four elements—physical energy, spiritual energy, natural energy, and the power of the Ten-Tails—under the original 'Six Paths Sage Technique'!

With the introduction of the fifth variable, the power of the underworld, the five are seeking a new balance!

Once the balance is established, dramatic changes ensue!

call out!

The reincarnation pattern on the back of the feather is pierced by a cross pattern.

Within the chakra aura, shimmering white specks of light drifted about!

Whoosh! Whoosh! Whoosh! One by one, the Seeking the Dao Jade reappeared, a total of twelve, six of them jet black and six of them pure white!