Chapter 266: The Path of the Immortal Body
"Senjutsu chakra!"
The moment Ragnar spoke this unfamiliar term, Yahiko, Nagato, and Konan leaned forward with identical expressions of curiosity.
Chakra—everyone knew about chakra. It was the fundamental energy that shinobi refined through training, the invisible fuel behind every jutsu, every technique, every feat that defied ordinary human limitation. But add the word Senjutsu to it, and suddenly the familiar became mysterious. Sacred, even.
"Teacher," Yahiko's hand shot up, his thirst for knowledge burning brighter than either of his companions', "what exactly is Senjutsu chakra?"
Ragnar looked at the three eager faces before him. He would not hide this knowledge. They were his students. They deserved the truth.
"Senjutsu chakra is the product of combining natural energy with the chakra refined within a shinobi's body. At its essence, it is still energy—but it is energy elevated. When you use Senjutsu chakra to perform a technique, the power of that technique is multiplied several times over."
He paused, letting the concept settle.
"Natural energy exists everywhere in the world around us. It flows through the air, the earth, the water. It is the lifeblood of the planet itself. But it cannot be seen with the naked eye. It hides in plain sight."
"That sounds incredible!" Yahiko's eyes blazed with excitement. "Teacher, can we learn it?!"
Ragnar shook his head.
"No."
Yahiko's face crumpled. "Why not?"
Nagato spoke before Ragnar could answer. "This kind of cultivation must require extremely strict conditions."
"You're correct," Ragnar said. "Senjutsu chakra is more potent than ordinary chakra, and controlling it demands far greater willpower. Natural energy is not gentle. It is not docile. It will not bow to a shinobi simply because they wish it to. It is violent. Destructive. If you lose focus for even a moment, it will devour you from the inside."
He let the weight of those words press down on them.
"Absorb too much natural energy, and you transform. Not metaphorically. Physically. Your body warps. Your mind shatters. You become a monster—a creature of mindless destruction. And even if you somehow survive that, there is another fate waiting. Petrification. Your flesh turns to stone. Your consciousness trapped forever in a frozen shell."
Yahiko's enthusiasm visibly deflated. "That... that sounds terrifying. But teacher, aren't you afraid of the backlash?"
Ragnar's expression remained relaxed. "I have a unique constitution. My body is naturally attuned to the forces of the natural world. Natural energy and I exist in harmony. There is no risk of backlash for me."
What he did not explain—what would have been impossible to explain to children who had never encountered Haki—was that Kenbunshoku served as his bridge. The Color of Observation was fundamentally different from the other two Haki types. It was the Haki of connection. Of listening. Of understanding. Through it, he could communicate with the world's energy in a way no ordinary shinobi could replicate.
He had no formal Sage Mode cultivation method. No ancient scroll. No contract with a sage lineage. Everything he had achieved with Senjutsu chakra, he had achieved through instinct and the unique properties of his Haki alone.
And because he had followed no standard path, he had no standard path to teach.
"If I possessed a systematic cultivation method for Senjutsu," Ragnar admitted, "I would not keep it from you. But the truth is, my method cannot be replicated. It relies on abilities that are... unique to me."
He looked at each of them in turn.
"Among the three of you, if anyone possesses the natural talent to condense Senjutsu chakra, it is Nagato. Yahiko, Konan—your path lies elsewhere. Master your chakra to its peak, and you will have nothing to be ashamed of."
The Rinnegan alone granted Nagato the qualifications to learn Sage techniques. Combined with the Uzumaki bloodline and its innate physical resilience, the potential was undeniable. Uzumaki Naruto, in another timeline, had proven exactly that.
"I can learn it?" Nagato murmured, genuine surprise flickering across his features.
"Yes. But I do not recommend it."
Nagato blinked. "Why?"
"Because you possess the Rinnegan. The path of Senjutsu is redundant for you. Your eyes already grant you access to powers that most shinobi could not dream of. What you need is not more external power sources. What you need is to strengthen your foundation."
Ragnar fixed Nagato with a piercing stare.
"You must excavate the latent potential of your Uzumaki lineage. Only by strengthening your physique will you avoid being consumed by the Rinnegan's backlash. Only then will you be able to truly control those eyes—not merely wield them, but master them."
He paused, letting the gravity of his words sink in.
"The Uzumaki clan is born with the seeds of an immortal body. But possessing the seeds is not the same as harvesting the fruit. That transformation requires effort. Relentless, brutal effort. Your bloodline gives you the potential—but potential unrealized is worth nothing."
Nagato was silent for a long moment.
What his teacher described... the immortal body... it was the birthright of his clan. The thing that had made them both blessed and cursed. He had felt its power as a child—the quick healing, the boundless stamina, the sense that his body was more alive than those around him. But since the Rinnegan had awakened, that vitality had slowly drained away. The eyes demanded a price. Every day, they took a little more.
If there was a way to reverse that...
If he could become strong enough to carry these eyes without breaking...
"Teacher," Nagato said quietly, "I understand."
In truth, the immortal body was a concept that ran deeper than most shinobi ever realized.
According to the ancient history Ragnar carried in his memory—history that had not yet unfolded—the Sage of Six Paths had two sons. Asura and Indra.
Indra was the genius. He inherited his father's powerful eyes, the precursor to the Sharingan. He invented ninjutsu itself, laying the foundation for the entire shinobi world. His talent blazed so brightly that it cast shadows across generations.
Asura was... ordinary. No inherited ocular power. No divine sight. Just a basic immortal body—the raw physical vessel, undeveloped and unremarkable. For years, Asura doubted himself. He felt inadequate. A failure. A poor excuse for a son of the Sage.
But the Sage saw what Asura could not. Hidden within that ordinary vessel was a power equal to Indra's eyes. The immortal body, fully realized, was not the lesser inheritance. It was simply... quieter. Slower to bloom. But no less mighty.
Asura spent years training, pushing himself past every limit, unlocking the potential coiled within his flesh. And in the end, he defeated his genius brother and became the successor of the Ninja Sect.
Some believed Asura won because he awakened Wood Release. This was a misunderstanding. Wood Release, in the grand schema of the Yin-Yang Five Elements, was not the strongest attribute. On the contrary—it was among the most fragile. And yet, that fragile attribute defeated the mighty Indra. Why?
Because Wood Release was never what made Asura strong.
The immortal body was the true source of his power. The flowering of physical chakra, cultivated through ceaseless, brutal effort. That was what elevated Wood Release from a weak nature to a force that could tame Tailed Beasts. That was what allowed Senju Hashirama's Wood Release to surpass Yamato's by orders of magnitude.
It was not the technique that was strong. It was the person.
Ragnar thought of the Valley of the End—the final battle between Naruto and Sasuke at the end of the story he remembered. Sasuke had unleashed Indra's Arrow, a super-S-rank forbidden technique fused with the power of all nine Tailed Beasts. Naruto had countered with... an ordinary Rasengan. The Nine-Tails had been drained to exhaustion. His Senjutsu chakra was spent. All he had left was the last dregs of his own strength, barely enough to form a spinning sphere.
By any logical measure, Sasuke's attack should have annihilated him.
And yet, the two attacks clashed. Both men lost an arm. Both collapsed in exhaustion.
But Naruto woke first.
The immortal body. The flowering of physical chakra. Kishimoto himself had stated that Naruto's body contained power equal to—perhaps greater than—the Nine-Tails. It was not the fox that made Naruto strong. It was Naruto who made the fox's power his own.
Ragnar turned his gaze back to Nagato. The boy's Rinnegan glowed faintly in the dim light of the cabin, beautiful and terrifying in equal measure.
The Nagato of the original timeline had been consumed by those eyes. Crippled. Emaciated. A god-like will trapped inside a corpse-like frame.
This Nagato would not share that fate.
"Your eyes are a gift," Ragnar said. "But a gift that destroys its wielder is no gift at all. It is a curse disguised as a blessing. The only way to break that curse... is to become strong enough to carry it."
Nagato met his teacher's eyes. For the first time in a long while, the storm of doubt within him quieted.
He knew what he had to do.
(End of Chapter)
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