Chapter 172: Expanding Rasengan: Great Spiraling Ring! Human Puppet Technique: Regeneration Core!
Minato's expression turned serious, his smile vanished, and he stared intently at his raised right palm—almost as if he were taking the most important test of his life. He muttered to himself:
"I think I understand where I went wrong!"
"To make the Light Wheel Cat Claw Reverse Inspired Whirlwind Uchiha Double-Palm Rasengan explode—"
Tsukasa couldn't help but twitch his lips. "I told you not to use that name anymore!"
The slight complaint didn't affect Minato's concentration, and when Minato spoke next, Tsukasa immediately stiffened and listened carefully.
At this moment, a brilliant blue sphere appeared in Minato's palm.
Unlike a normal Rasengan, this one was much deeper in color.
Moreover, as soon as it appeared, the sphere began to expand rapidly, and its surface became extremely unstable.
"I understand!"
Minato raised an eyebrow, staring intently at the expanding Rasengan in his palm, and exclaimed in realization:
"The key isn't the raging chakra swirling around the core!"
"It's the core itself. Just like you said—you need to suppress the chakra protruding from the sphere to stabilize the technique."
"Previously, because I unconsciously imitated the Tailed Beasts, I compressed the core, causing the chakra swirling around it to spin faster, leading to loss of control."
"So, the crucial element is—"
"Compression!"
"Compressing the core of the Light Wheel Cat Claw Reverse Inspired Whirlwind Uchiha Double-Palm Rasengan!"
Looking at the rapidly expanding Rasengan in Minato's palm, almost ready to explode, Tsukasa's eyes widened slightly.
In that instant, he felt like a detective who'd just solved a case—suddenly enlightened!
Minato, as expected of the Rasengan's creator, had quickly deduced the reason for the failure after completing the normal form.
Indeed, for questions about the Rasengan, it was always faster to ask the creator!
Because Minato had witnessed the Tailed Beast Ball, when conceiving the Rasengan, he'd developed this new technique modeled after it—resulting in this inflated Rasengan that resembled the Tailed Beast Ball!
It compressed the core, increased centrifugal force, and drove the chakra into a berserk state, accelerating its rotation until it became uncontrollable and began expanding out of control!
Furthermore, from Minato's words, Tsukasa quickly connected it to another Rasengan variant—one that only appeared in the Road to Ninja movie, used by Uzumaki Menma in the limited Tsukuyomi world:
The Spiraling Ring!
Its principle was also compression, but it compressed both the core and the surrounding rotating chakra together.
Its advanced version—the Great Spiraling Ring—had a range no less than that of Super Shinra Tensei!
A single strike could destroy all of Konoha!
At this moment, Minato's eyes lit up slightly again. From this Rasengan variant, his sharp intellect immediately connected it to a technique with roughly the same principle.
"If the core and outer chakra are compressed together, perhaps this form of the Light Wheel Cat Claw Reverse Inspired Whirlwind Uchiha Double-Palm Rasengan could also be stabilized?"
"Moreover, the power... seems like it could increase even further?"
Tsukasa fell silent, unsure how to answer Minato's question.
Increase? Of course it could increase—after all, this was the Great Spiraling Ring!
The problem was, what the hell was happening here?
Under his influence, could Minato actually develop the Great Spiraling Ring that only appeared in the movies?
This... this was bad! Minato had received a super-powerful boost!
If he used the Flying Thunder God Technique to teleport above an enemy village and dropped a Sage Art: Great Spiraling Ring, the scene would be too devastating—Tsukasa didn't even dare to imagine it!
Leaving aside distant examples, let's talk about the immediate future.
What would the AB Brothers—the future Raikage and Killer B—think when they encountered their arch-rival's protégé pulling out a Spiraling Ring technique? How much psychological trauma would they suffer?
However, just as the two were deep in thought, developing their new technique and beginning to discuss it, in the distance—
Nohara Rin waved from afar, calling out:
"Minato-sensei, Tsukasa-san, it's time to cook!"
The three genin returned carrying collected firewood and wild vegetables.
As soon as they looked up—
They saw Minato holding a rapidly expanding, azure, violent, and extremely unstable sphere of light in his palm!
Their teacher stood there completely ignoring this thing that was about to explode, his eyes shining, chatting and laughing with Tsukasa beside him.
The scene was so unbelievable that the three children were instantly stunned!
Obito was so frightened that the dry branches in his hands clattered to the ground as he shouted in terror:
"Sensei! Tsukasa!!"
"It's going to explode! It's going to explode!"
"Huh?" Minato suddenly paused, then looked up in realization at the Rasengan about to detonate in his hand. His pupils contracted involuntarily.
He immediately vanished from his spot, appearing two hundred meters away at his Flying Thunder God marker, quickly throwing the expanding Rasengan, and instantly returning to the haystack.
The next moment—
BOOM!
The expanding Rasengan, unknowingly infused with massive amounts of chakra, exploded with a thunderous bang, creating a pillar of light not far away!
A sudden gust of wind swept across their faces, swirling dirt, grass roots, and broken tree branches in all directions!
"What was that?!"
Kakashi and the others stared in disbelief at the explosion site, lowering their arms that had been shielding their faces from the wind, looking bewildered at the disheveled Minato.
At that moment, Minato breathed a sigh of relief, then looked up, scratching his head with a slight smile.
"Well, it's just a new technique under development."
"It's quite dangerous right now—it could explode at any moment."
He turned to Tsukasa and added:
"Tsukasa, we can discuss the technique properly when we get back to the village. Since things have come to this, let's eat first."
Tsukasa nodded.
He'd learned the principle of the Expanding Rasengan from Minato and had also mastered the basic Rasengan itself.
He'd already gained a tremendous amount, and he assumed Minato had gained just as much.
The remaining issues—such as controlling dark chakra to condense the Dark Rasengan, combining it with Sage Mode, and developing the technique toward an artificial Tailed Beast Ball—would need to be resolved by him alone.
Moreover, Tsukasa had a premonition that practicing this technique would be incredibly disruptive. This wasn't a suitable place for training.
As for the principle of the Expanding Rasengan that Minato mentioned—specifically how to compress the Rasengan's core—
Tsukasa already had a general idea.
The inspiration came from the skill that had dropped from Ebizō after he'd killed him.
He narrowed his eyes slightly, using his consciousness to open the system panel, searching through the list of notifications to find the most recently acquired skill—
[Ding!]
[You bravely defeated Ebizō, Sunagakure's supreme commander who attempted to kill you. You obtained a random skill from him: Human Puppet Technique: Regeneration Core (A-Rank, Beginner)]
[The counterattack was powerful; the opponent is deceased and unable to retaliate. The reward has resulted in a critical hit.]
[The skill has critically upgraded. Current attribute: Human Puppet Technique: Regeneration Core (A-Rank, Proficient)]
[Your Heart of Steel layers have increased.]
Human Puppet Technique: Regeneration Core!
This technique was a prerequisite jutsu for Sasori of the Red Sand—the genius of Sunagakure and future S-rank missing-nin of Akatsuki—to achieve his concept of eternal art.
Sasori had transformed himself into a human puppet and modified his heart into an eternally indestructible chakra regeneration core, achieving a unique form of immortality. With this regeneration core
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