Uchiha Shinsuke knew that before achieving the Eternal Mangekyō, there was a risk of blindness from overusing the Mangekyō.
But now he had "Ocular Power Adaptability: Extreme"!
It directly reduced the side effects by 50%, and the speed of Mangekyō control was increased by 300%, saving a tremendous amount of time that would otherwise be spent developing the Mangekyō.
The ocular techniques that came with the Mangekyō, as well as the divine power of Susano'o, could all be mastered quickly.
Susano'o in particular was something that could not be developed to its complete form within any short span of time.
With this accelerating support ability, Shinsuke was confident he could master the Mangekyō's ocular techniques and the use of Susano'o within a short period of time.
Uchiha Shinsuke stepped before a standing mirror, which clearly reflected his appearance at this moment.
It was still that same sharp-featured, strong-lined face.
But those eyes had changed completely.
No longer were they the three black tomoe that had slowly rotated around jet-black pupils.
In their place was a pair of Mangekyō Sharingan, filled with authority and an overwhelming pressure.
Left eye: "Temporal Reversion"!
Right eye: "Technique Amplification"!
This was the Mangekyō Sharingan that belonged exclusively to him, Uchiha Shinsuke.
"Temporal Reversion"...
This was no simple rewind.
Shinsuke could feel that what was contained within this eye was the most elementary, yet also the most direct interference with the laws of time.
He then touched his right eye.
"Technique Amplification"...
This one was straightforwardly and brutally powerful.
Any jutsu, in his hands, would have its power enhanced to an unimaginable degree.
With the same Fire Style technique, others might only be able to burn down a single tree, while he could potentially incinerate an entire forest.
Uchiha Shinsuke drew a deep breath and forcibly suppressed the turbulence within him that had surged from his explosive gain in power.
Now was not the time to be intoxicated by power.
The most pressing task was to familiarize himself with and gain control over this brand new power as quickly as possible, converting it completely into his own combat capability.
'Let me first test the ability of the left eye... "Temporal Reversion."'
With a single thought, Shinsuke focused his attention on his left eye.
The three sharp sickle-blade patterns, driven by Shinsuke's will, began to gradually accelerate their rotation.
Uchiha Shinsuke took out a kunai and cut open a wound on his arm.
"Revert!"
He muttered under his breath.
The sickle-blade pattern in his left eye suddenly jolted, then erupted with a powerful burst of ocular power.
Hummm!
An invisible wave, with Uchiha Shinsuke's body at its center, spread outward in an instant.
In the next moment, something inconceivable happened.
The cut wound closed on its own, directly and completely.
It was as though it had never existed.
The chakra and physical strength that had been consumed during the awakening were also directly restored to their full state.
In just a few breaths' time, Uchiha Shinsuke's physical condition had recovered to an unprecedented peak.
'This... this is the power of "Temporal Reversion"?'
Shinsuke's eyes were filled with astonishment.
This was far more than a simple healing technique.
It was the rewinding of his own condition back to a point in the past where he had been completely whole and unharmed.
Although this reversion was not without its limits, Shinsuke could sense that this heaven-defying skill could currently only be used once per day.
But even so, this was already a life-saving divine technique pushed to the absolute extreme of the absurd.
In battle, as long as Uchiha Shinsuke still had a single breath left, he could use "Temporal Reversion" to instantly recover to peak condition and throw himself back into the fight.
Just imagine the despair an enemy would feel, already completely exhausted, only to discover that Shinsuke had suddenly recovered to full strength.
And as Shinsuke's ocular power grew stronger and his understanding of the ability deepened, he would in the future be able to achieve a wider range, a longer duration, and even... apply temporal reversion to others.
Space is sovereign, but time is king, and the Mangekyō ocular technique that contained the power of time had staggering potential for development.
What a terrifying prospect that would be.
'Next, the right eye... "Technique Amplification."'
Uchiha Shinsuke stepped into the small courtyard.
He shifted his attention to his right eye.
A current of ocular power spread outward from Shinsuke's right eye.
"Fire Style: Great Fireball Technique!"
He muttered under his breath and expelled the gathered chakra in a violent burst.
Whoosh!
A fireball the size of a human head shot roaring toward the wooden post.
This was Uchiha Shinsuke's most fundamental Fire Style jutsu, entirely unremarkable in power.
The three spiral patterns in Shinsuke's right eye suddenly accelerated their rotation.
"Technique Amplification"... activated!
Hummm!
Something inconceivable happened.
That originally ordinary fireball, rather than expanding in size as it flew through the air, instead began to compress inward on itself in a bizarre manner.
The color of the flames rapidly shifted from ordinary orange-red to a blazing platinum white.
The temperature surged wildly.
The energy contained within it multiplied at a geometric rate.
Boom!!!
A thunderous explosion rang out, several times louder than any Great Fireball had ever produced before.
A violent shockwave, carrying a scorching blast of hot air, swept outward in every direction.
The entire small courtyard shuddered violently under the impact.
Uchiha Shinsuke instinctively raised his arm in front of his face to shield against the wave of heat rushing toward him.
When the smoke and dust cleared, the wooden post had vanished entirely, and even the ground had been blasted open into a large crater several meters across.
This... was this still the Great Fireball Technique?!
This level of power was already comparable to some advanced B-rank, or even entry-level A-rank Fire Style jutsu.
Shinsuke's eyes instantly filled with wild elation.
"Technique Amplification"!
As its name implied, it amplified the power of jutsu.
And furthermore, this amplification was not a simple increase in chakra volume, but rather a fundamental transformation of the jutsu's quality.
Compression, purification, amplification!
It bestowed upon jutsu a far more terrifying destructive force.
'What if... "Technique Amplification" were applied to Lightning Style?'
The style Shinsuke was most skilled in was Lightning Style.
In particular, his self-created "Thunder-Fire Dragon Breath," as well as the refined "Lightning Style Chakra Mode."
If those techniques were then bolstered further by "Technique Amplification"...
Shinsuke could hardly begin to imagine what terrifying level their power would reach.
Shinsuke forcibly suppressed the urge to try it immediately.
His own courtyard was simply too small, unsuitable for testing jutsu of excessive power.
The Thunder-Fire Dragon Breath was out of the question, but the Lightning Style Chakra Mode was something he could try.
Shinsuke immediately activated the Lightning Style Chakra Mode, then applied "Technique Amplification."
The speed and strength that had already been enhanced by the Lightning Style Chakra Mode surged again with an additional sharp increase.
Shinsuke estimated that this amplification raised them by at least thirty percent or more.
Crackle!
The lightning that enveloped Shinsuke's body no longer surged outward violently, but instead contracted inward, clinging tightly to the surface of his skin.
The color of the lightning shifted from a sharp, bright blue to a deep, dark violet.
The rate of chakra consumption also reached a terrifying level.
A swift finish was an absolute necessity.
That thought had barely formed when his body had already reacted ahead of his conscious mind.
He had only intended to move from one end of the courtyard to the other.
Flash!
No sound.
No process.
One moment he was still in place, and the next he had already appeared before the wall over ten meters away.
His body, moving so fast it had outpaced itself, still held a forward-lunging posture, and one hand pressed against the wall instinctively.
Crack...
The solid wall crumbled like tofu as Shinsuke easily pressed a deep, crack-covered crater into it.
Uchiha Shinsuke slowly turned his head back.
He looked toward the spot where he had been standing moments before.
The ground there had fractured inch by inch from Shinsuke's instantaneous burst of movement, forming a small depression.
This...
This was the Lightning Style Chakra Mode under "Technique Amplification"?
This was not speed at all, this was teleportation.
In actual combat, an enemy would not even be able to track his movements.
After the wave of wild elation came a sudden and sharp pain.
Uchiha Shinsuke immediately deactivated "Technique Amplification" and the Lightning Style Chakra Mode.
In less than ten seconds of activation, nearly one-third of Shinsuke's chakra had been almost completely drained.
More critically, there was the burden on his eyes.
The Great Fireball earlier had only consumed his ocular power to a minor degree, but switching to the Lightning Style Chakra Mode not only devoured a tremendous amount of chakra, it had also consumed roughly half of his ocular power.
This was a true trump card technique, to be used only in moments of critical danger.
However, if this move were combined with "Technique Amplification," its endurance would be pushed to its absolute maximum.
Having finished testing the Mangekyō's abilities, Shinsuke looked at the two sites of destruction in the courtyard.
One was the large crater left by the Great Fireball.
The other was the fractures left behind by the teleportation.
"It looks like I'll need to have someone come and make repairs tomorrow!" Shinsuke said with a rueful smile.