Returning to the training room, Naruto sat cross-legged to adjust his breathing and recover the Chakra he had consumed while testing Susanoo on the sea earlier.
After a few deep breaths, he opened his eyes, the scarlet Mangekyo casting a deep glow in the dim training room.
Having tasted the benefits of Amenotokotachi strengthening Kamimusubi, his desire to systematically strengthen every ability he possessed grew stronger.
The first target for strengthening was his Kekkei Tota, Light Release.
Amenotokotachi!
A force breaking through limits surged from the depths of his ocular power, flowing along his optic nerves into the Chakra pathways throughout his body.
The next second, Naruto's entire body began to emit a blinding white light. He hurriedly invoked Absolute Control, firmly suppressing this Light Release Chakra that was breaking through its limits within a controllable range.
A moment later, the white light gradually receded and merged back into his body, but Naruto could clearly feel that Light Release had undergone a qualitative change.
He pressed his five fingers together into a blade shape, and stabbed straight into his left chest. His palm passed through his chest. There was no resistance, no wound, and no blood.
"Elementalization." Naruto whispered.
After being strengthened by Amenotokotachi, Light Release broke through the inherent limits of Kekkei Tota and gained the ability of Elementalization. He could now freely switch his body between light and solid form.
In the state of Elementalization, all physical attacks would pass directly through his body. Not only that, the Chakra consumption of Light Release was significantly reduced, and his speed was raised another level on top of the original foundation.
Compared to the physical immunity brought by Elementalization, Naruto valued the tactical value brought by the change in body form after Elementalization even more.
A mass of light could achieve many things that a solid body could not. For example, when moving at high speeds, the body would endure immense reactionary force due to extreme acceleration, but he could now elementalize his body the moment he accelerated, avoiding this reactionary force and pushing his speed to the theoretical limit of Light Release.
His body was no longer a solid object restricted by physical laws, but a beam of light that could change shape at will, penetrate obstacles, and flow freely through space.
Afterward, Naruto began to adapt to the enhanced Light Release in the training room.
Only then did he turn his gaze to another core ability.
Flying Thunder God Technique!
Up until now, the activation of Flying Thunder God Technique had an unavoidable prerequisite. One must leave a Flying Thunder God Technique mark at the target location beforehand.
This restriction did not matter in most situations, but in high-intensity skirmishes, when facing enemies one had never encountered or in unfamiliar environments, having no mark meant being unable to teleport.
Naruto aimed Amenotokotachi at the structural formula of the Flying Thunder God Technique.
A moment later, the Mangekyo stopped rotating.
Naruto lifted his head and looked at a corner of the training room.
The next moment, his body vanished from its original spot and appeared in the corner. The entire process had no transition, his body arrived the moment his gaze did.
He raised his head again to look at the stone wall on the other side of the training room, and his body instantly teleported there again, also without any delay, and also without any mark taking effect.
Wherever his eyes could see, he could arrive instantly. No mark was needed.
Naruto tried looking at a position behind a wall, but the Flying Thunder God Technique did not respond.
"So, places that cannot be seen, such as spaces blocked by walls, still require a mark to be left beforehand to teleport." Naruto remarked thoughtfully.
After breaking through its limits, Flying Thunder God Technique gained a new characteristic: line-of-sight teleportation.
As long as it was any position within his field of vision, even without a Flying Thunder God mark, he could teleport. This removed the greatest restriction of using the Flying Thunder God Technique.
In battle, wherever his field of vision covered, he could instantly appear there. Combined with the extreme speed after Elementalization, his mobility on the battlefield had now reached an inconceivable level.
Naruto suppressed his satisfaction and continued to aim Amenotokotachi at the next ability.
Adamantine Sealing Chains was a bloodline Fuinjutsu passed down through the generations of the Uzumaki clan, manifesting Chakra into chains, specifically designed to restrain Tailed Beasts, and its power was indisputable.
But its weakness was equally obvious. The chains were solid, could be blocked, dodged, or broken free from head-on by enough strength.
A moment later, Naruto raised his right hand, and several golden chains extended from his palm. Unlike before, the edges of these chains no longer had a metallic luster, but carried a faint sense of spatial distortion, as if they existed between solid and ethereal forms simultaneously.
After breaking through its limits, Adamantine Sealing Chains not only saw its sealing power increase exponentially, but the chains also possessed a spatial locking characteristic. Once locked by the chains, the space around the target would also be sealed simultaneously, and no spatial technique could be activated within the locked area.
"Locking space? What a great characteristic." Naruto's lips curved upward.
Afterward, he focused on Negative Emotions Sensing.
A moment later, a brand-new stream of sensory information flooded into his mind.
After breaking through its limits, Negative Emotions Sensing was no longer limited to sensing others' goodwill or malice toward him, but could actively scan a person's deep-seated good or evil tendencies.
Regardless of whether this person held hostility toward him, as long as he wished, he could perceive whether the other party's essence was good or evil. This ability could not only be used to see through disguises but also exert great value during negotiations, interrogations, and identifying spies.
Afterward, Naruto looked at another sensory ability, Mind's Eye of the Kagura.
Amenotokotachi activated again, and the sensory range of Mind's Eye of the Kagura expanded exponentially.
Mind's Eye of the Kagura, which could originally cover the entire Konoha, now had a sensory range that covered the entire Land of Fire after being strengthened.
Not only that, every Chakra signal that appeared within the sensory range would be automatically analyzed and stored in his mind. The next time he encountered the same Chakra signal, no matter when or where, he could retrieve the previous record to compare.
In the words of his past life, Mind's Eye of the Kagura now came with a Chakra database and facial recognition function.
Finally, Naruto aimed at the Multiple Shadow Clone Technique.
Multiple Shadow Clone Technique was Naruto's signature Ninjutsu, but it had a pain point.
That was that Shadow Clones were too fragile and would dissipate after sustaining a certain degree of attack. Several Shadow Clones had turned into white smoke just by being swept by Eight-Tails' vortex.
After the strengthening was completed, Naruto waved his hand to create a Shadow Clone.
After the Shadow Clone appeared, he raised his hand and struck it with a punch, using roughly the same force as the Light Speed Kick he had used to send Bee flying at the border.
The Shadow Clone was sent flying, crashing into the barrier of the training room.
However, the Shadow Clone did not dissipate. It climbed up from the ground and patted the dust off its body.
"How do you feel?" Naruto asked as he walked up.
"I can take more hits than before." The Shadow Clone stretched its shoulders. "But it still hurts."
"So, the strengthened Shadow Clone is no longer a fragile thing that disappears upon taking a certain amount of damage, but has the durability of a physical ninja. It won't dispel as long as it isn't completely shattered. So, is this a good thing or a bad thing?" Naruto fell into deep thought.
The advantage is that it's more durable. The disadvantage is that feeling pain means it will be transmitted back to the main body.
"Wait, use Chakra to recover from the pain, and then dispel the Shadow Clone." Naruto thought of something and said to the Shadow Clone.
"Got it, main body." The Shadow Clone nodded.
It began using Chakra to alleviate the pain. A moment later, sensing that it was about right, the Shadow Clone dispelled itself.
Naruto received the memories and the corner of his lips curled up.
"Not bad. The Shadow Clone feels pain, but if the injuries are healed, it won't transmit that pain back to the main body."
Subsequently, he took out the three scrolls Tsunade had given him.
He opened the first scroll, and as the seal was lifted, he saw that the scroll was densely packed with content. After just a glance, Naruto was stunned.
"This is..."
This was not the list of mission rewards he had expected.
What was recorded in the scroll was the Medical Ninjutsu system personally taught by Tsunade. The Chakra circulation paths for the Mystical Palm Technique, the precision control essentials for the Chakra Scalpel, the Chakra burst nodes for Chakra Enhanced Strength, and even the Heavenly Spear Foot, a high-level taijutsu self-created by Tsunade, were all recorded in great detail.
But what surprised Naruto most was the latter half of the scroll. It recorded the complete training methods for the Yin Seal and the Strength of a Hundred Technique.
The Yin Seal allows one to store excess Chakra bit by bit in the forehead, accumulating a vast Chakra reserve over time.
The Strength of a Hundred Technique involves releasing the Yin Seal at a critical moment, unleashing the accumulated Chakra all at once to achieve automatic regeneration during battle without the need for hand seals.
These two techniques were Tsunade's trump cards.
Naruto flipped through the scroll roughly from beginning to end. Besides these Ninjutsu, there was also a reward of ten million Ryo attached to the end of the scroll.
"As expected of Granny Tsunade, she's much more generous than Pervy Sage." Naruto smiled and resealed the scroll.
Jiraiya had chased him for so long just to teach him Senjutsu, while Tsunade had directly packed up her trump card Ninjutsu and shoved them over.