That's right, Takuno had already transplanted that pair of Shisui's Mangekyō Sharingan for himself.
And similarly "possessing" the Uchiha bloodline, he could naturally also freely control the switching on and off of this pair of Sharingan that did not belong to him, completely unlike Kakashi.
As for over at Shisui's side, he had of course also temporarily transplanted a pair of ordinary eyes for the other party; it was basically impossible to be exposed, unless Shisui himself woke up into clarity.
But looking at the other party's current state, the time he needed to completely wake up into clarity would certainly not be short.
At the same time, in order to be completely foolproof, his Wood Clone would also stare at the situation over there for a long period of time.
And now, he conversely needed to go test the majestic power of this pair of Mangekyō Sharingan!
After Takuno successfully transplanted Shisui's Mangekyō Sharingan, he first keenly detected an unexpected situation.
This pair of legendary Mangekyō, in terms of basic eyesight, actually appeared even more blurry and unclear than his own original three-tomoe Sharingan.
Only when he actively injected pupil power to perform addition and support could the superiority of the Mangekyō Sharingan in insight capability clearly manifest out.
This discovery caused him to be a bit puzzled; very quickly, combining with his understanding toward the Mangekyō Sharingan's characteristics, Takuno rapidly deduced the core reason for the eyesight decline.
This must boundingly be the aftereffect left behind by Shisui when he forcefully overdrew his own potential to open Susanoo during that fierce battle not long ago.
After all, the Mangekyō Sharingan was a double-edged sword that possessed massive power yet heavy depletion.
Excessively utilizing its power would ultimately unavoidably slide toward the abyss of blindness; and furthermore, the more frequently it was used, the more severe this problem became!
This point was clearly verifiable within the original work; the most typical examples were Itachi and his younger brother, Sasuke.
The two of them as brothers had both once experienced the trouble of blurred vision brought by the Mangekyō.
Itachi's Mangekyō had been open for many years before his eyesight gradually declined; this was perhaps related to his relatively restrained use of the capability and possessing reservations; even if so, the shadow of blindness also always shrouded him.
Looking conversely at Sasuke, the situation was then completely different; his Mangekyō Sharingan's opening time was far shorter than Itachi's, yet it similarly rapidly presented outstanding eyesight problems.
Inquiring to its root, it lay in that Sasuke's abuse toward the Mangekyō's power was near-entirely without restraint, multiple times forcefully breaking through limits at the tight junctures of battle, excessively squeezing out pupil power.
This kind of frequent limit depletion, added together with near-entirely failing to give the eyes any time for recovery and rest, was precisely the chief culprit leading to the other party's Sharingan eyesight sharply deteriorating within a short period of time.
While Shisui's behavior pattern in the previous battle happened to be highly similar to Sasuke's experience.
Both were forcefully urging the ultimate power of the Mangekyō regardless of consequences under extreme situations.
Therefore, this pair of eyes of Shisui had already presented irreversible eyesight damage prior to the transplant.
And furthermore, Shisui did not like Obito possess Hashirama cells.
That majestic life force and chakra of Hashirama cells was the key "fuel" to repair Mangekyō depletion and delay or even avoid blindness.
Shisui lacked this precious recovery resource; this meant that the eyesight defect of his pair of Mangekyō Sharingan had very likely already evolved into a permanent, un-reparable damage.
However, this defect toward Takuno was of no importance.
He transplanted this pair of eyes originally having other designs, by no means planning to long-term rely on it.
Even if in the future he were not very satisfied toward the Mangekyō he himself might awaken, the target recognized within his heart would also be that pair of Mangekyō possessing the space power of "Kamui," rather than Shisui's pair of Mangekyō containing the illusion power of "Kotoamatsukami."
Shisui's eyes toward him were merely a transition tool as well as a research object.
After clarifying the reason for this pair of Sharingan's eyesight problem, Takuno then threw it behind his brain, beginning to concentrate his energy and set about exploring and digging out the other powers and secrets contained within this Mangekyō Sharingan.
The Mangekyō Sharingan—this power originating from the deepest part of the mind—its mystery was by no means something that could be completely understood on the day of awakening.
To harness it needed an exploration and integration process.
Although Takuno had long since known the capability of this pair of Mangekyō within his hand was "Kotoamatsukami," and even more understood its prestigious name of being praised as the "strongest illusion," knowing its name was different from truly understanding and controlling it.
In the room, the candle flame flickered, the light traveling upon the sinister crimson Mangekyō patterns.
Takuno held his breath and concentrated his spirit, his fingertips near-unconsciously brushing across his eye sockets, his consciousness sinking into that deep vortex of pupil power.
He carefully and cautiously tested, guiding, like groping for the sole light source within a dark maze.
Benefiting from that piece of foreknowledge, his groping was countless times smoother than a blind explorer's, yet it was also by no means achieved in a single stride.
Finally, after countless times of cautious attempts and failures, a certain difficult-to-express "pathway" suddenly cleared through within his perception.
He felt that he had touched the core of "Kotoamatsukami."
However, precisely within this flash when the feeling of control arose spontaneously!
Takuno's pupils abruptly shrank into needle points.
A strand of unprecedentedly intense astonishment instantly drowned out all his thoughts.
It was not that the power was difficult to harness, but conversely... this forbidden power praised as the "strongest" had actually already entered CD!
"In cooldown... Kotoamatsukami... has actually already been in cooldown?!"
This discovery exploded loudly within his brain; this meant a single fact.
Shisui, the original master of this pair of eyes, prior to losing it, had already cast this ultimate illusion that rewrites the will toward a certain target!
Takuno's brow locked tightly.
"Who hit the Kotoamatsukami?"
Minato? That gentle yet position-determined Fourth Hokage?
Minato's attitude toward the Uchiha from beginning to end maintained a close attitude, but his fundamental position had never vibrated.
It appeared... not like the appearance of having his will eroded by Kotoamatsukami.
Fugaku? This thought surfaced even more intensely.
The current Uchiha clan leader—his choices and decisions were vastly different from that image within Takuno's "memory" that walked toward extremes and ultimately led to the clan's downfall.
Was it Kotoamatsukami that quietly nudged the pointer of his thoughts?
Takuno shook his head, dispersing this overly arbitrary guess.
The Uchiha clan's situation was already a world of difference compared to the desperate land within his "memory."
Fugaku acting as the clan leader making a gentler choice based on reality was in itself also logical; merely because the result was different to blame it upon Kotoamatsukami was unavoidably too hasty.
Then, this strand of "Kotoamatsukami"—exactly upon whose body was it used?
Was it a certain crucial figure who was overlooked by him?
This answer perhaps only Shisui himself knew.
Takuno was a bit curious; the truth was close at hand, yet also far away.
To go ask Shisui? This thought just arose when it was pinched out by himself; that was undoubtedly self-detonating that he used the other party's eyes.
As for utilizing the Spirit Transformation Jutsu to go inspect the other party's memory—with the other party's current state, if he dared use it, the other party would dare die, and this would not be very good!
If Takuno knew that Shisui's "Kotoamatsukami" target was Obito, the shock within his heart would perhaps far exceed the present.
Even more, for Shisui to now fall into a long-lasting coma, its direct trigger was precisely at that final juncture concerning life and death.
Disregarding everything to once more forcefully launch this forbidden-like power resulted in his already precarious mental power suffering a destructive overdraw.
However, even if Takuno learned of this truth, he would also absolutely not naively believe Kotoamatsukami could let Obito, who rebelled and left the village, from then on suddenly wake up and have his heart turn toward Konoha.
Within his heart he harbored a profound questioning toward this technique's actual efficacy; did the so-called "strongest illusion" Kotoamatsukami truly possess the absolute power to thoroughly control anyone?
Reviewing the few examples within the original work, the sole object that Kotoamatsukami explicitly successfully launched and displayed efficacy toward was Itachi under the Reanimated state.
Its power was granted shocking, even forcefully covering over the caster Kabuto's absolute control right toward Edo Itachi.
As for Danzo's single failed use toward the Samurai Mifune of the Land of Iron, strictly speaking it was merely the capability of Shisui's other single eye, and could not count as the complete display of Kotoamatsukami.
Relying solely on this single case of Edo Itachi was indeed also sufficient to display Kotoamatsukami's terrifying efficiency that towered above conventional illusions.
But its matter of covering over the Edo Tensei's control right was unable to let Takuno be convinced.
Because even if it were Kabuto's Edo Tensei, when facing legendary figures standing at the peak of the ninja world like Hashirama and Madara, its control power also appeared pale and powerless, unable to completely take effect.
Then, reasoning by analogy like this, could the Kotoamatsukami claiming to be the "strongest" one-hundred percent imprison the mind of a powerhouse of the same level as Madara? Takuno categorically denied this.
Even if it possessed the name of the strongest illusion on setup, are the examples of the setup's strongest as well as absolute defense ultimately being dispelled and face-slapped few in number?
Did those so-called "absolute defenses" also not collapse one after another in actual combat?
Therefore, even if Takuno confirmed the fact of Obito being hit by Kotoamatsukami, he would only interpret this as a temporary mental shock and interference.
This influence was granted profound, sufficient to manipulate Obito's judgment or behavior within a brief period of time.
But it absolutely had no possibility of becoming an eternal mental shackle, thoroughly and permanently reversing Obito's fundamental standpoint and conviction.
Of course, even if so, Takuno himself was also unwilling to face Kotoamatsukami.
Even if there were a sliver of possibility of having his will changed, it was all what he could not accept.
Finally, Takuno took a deep breath, arriving outside the laboratory.
Ultimately it still reached the most crucial moment, which was... the use of Susanoo!
Lacking a single fraction of hesitation, his double eyes fiercely condensed!
His originally pitch-black pupils were instantly soaked and dyed by crimson, three pieces of tomoe rapidly rotating and reorganizing, ultimately transforming into two rounds of sinister and complex Mangekyō patterns.
The violent pupil power consumption followed along subsequently, the burning pain reaching straight to the deep part of his nerves, two tracks of eye-striking bloodlines like tear marks winding and sliding down from his eye corners.
Simultaneously, a strand of majestic emerald-green light abruptly erupted from inside his body, like substantial flame rushing up into the sky!
The light rapidly condensed and shaped.
Initially, merely a massive and grim jade-green skeleton framework manifested out of thin air, protecting him within its chest cavity.
Takuno continuously squeezed out the pupil power originating from Shisui's pair of Mangekyō, crazily injecting it into the body of this newborn giant spirit.
The transformation began!
At the peak of the skeleton, a clearly contoured head rapidly congealed into shape, the hollow eye sockets flashing with an ominous green light.
Closely following behind, upon the grim white bones, heavy armor like a living thing spread and covered, from the shoulder blades to the chest and abdomen, and then to the four limbs; a metal-like luster traveled under the reflection of the green light.
At the skeleton's right hand position, the light violently distorted and stretched, ultimately condensing into a massive spiral sword entwined with spiral patterns!
The Susanoo standing erect before Takuno at this moment—its form and scale were already no different from the form Shisui initially displayed.
Reaching here it actually had still not ended; Susanoo once more began to undergo a change, its chest armor completely opening up, revealing that red tomoe core.
It was precisely that sky-supporting-and-earth-standing ultimate form during Shisui's fierce battle with Minato!
A green martial god of dozens of meters high—the sense of oppression was heavy like a mountain range.
However, at this time a strand of intense surprise slipped past Takuno's heart-mouth.
Not only did he not feel exhausted of force, but conversely he had room to spare!
The mental energy rushing within his body supported this massive creation actually appearing completely effortless.
A more daring thought emerged: perhaps he could still go a step further?
As for the price of doing this accelerating this pair of Mangekyō Sharingan toward blindness?
Anyway, this pair of eyes later on was not for him to use.
The determination was set!
He once more took a deep breath, his double eyes opening in fury, the fresh blood flowing at his eye corners instantly as independent as a mountain stream rushing wildly.
Accompanying this pupil power once more erupting, the massive green Susanoo shrouding around his body resoundingly began its ultimate transformation!
"Boom, rumble, rumble!"
The massive body shape at an unprecedented speed crazily expanded and pulled high! Within a brief moment it surpassed the nearby mountain peaks, the shadow cast down obscuring the moonlight.
The lower body that originally relied on the framework thoroughly solidified, two pillar-like legs standing sky-supporting steadily upon the earth, presenting a martial god posture complete in its true meaning.
The armor behind its back violently surged and deformed, accompanying an ear-piercing metal friction sound; a pair of massive wings composed of pure chakra and emitting an emerald-green light halo suddenly opened out!
Simultaneously, a pair of giant chakra double swords that did not count as inferior compared with the spiral sword, with a clanging sound, congealed out from the wing roots!
Takuno gazed at this Perfect emerald martial god, the shock within his heart unable to be added further.
This... was the Perfect Susanoo of legend?!
He actually at the first time using the Mangekyō Sharingan, and furthermore under the situation of another person's eyes, leapt across all stages in one action, straightly reaching this ultimate form of power?!
This result vastly exceeded all his anticipations.
But subsequent to the brief shock, reason rapidly returned.
Pondering carefully, this miracle that appeared inconceivable seemed to conversely be within reason.
The essence of Susanoo was the ultimate manifestation of Yin Release; its power source was precisely the caster's mental energy!
And this happened to be Takuno's own most outstanding foundation! Even if it were the Uzumaki bloodline's body energy, before his mental energy it also did not count as majestic!
Of course, even he himself prior to this had also not anticipated that the Yin Release power converted from his mental energy had actually already been sturdy enough to support the Perfect Susanoo...
This truly was... an unexpected joy!
But right now was absolutely not the time to be intoxicated by power.
He held his breath and concentrated his spirit, sinking all his perception capability within it; he wanted to profoundly experience the power contained within this Perfect Susanoo.
Even more, he wanted to precisely grasp the essence of that unique yet powerful "pupil power" belonging to the Mangekyō Sharingan, as well as its most fundamental and core distinction from the three-tomoe Sharingan he used previously!
Making final preparations for his own Sharingan's evolution!