As this thought crossed his mind, Sasuke's cold expression suddenly twisted into a cruel smile, accompanied by a dark, almost manic laugh.
But he quickly regained his composure and suppressed the disturbing impulse.
Merging with Ido Sasuke had inevitably left a profound impact on his psyche.
When alone, he would unconsciously slip into a state of utter detachment.
During battles, however, an overwhelming bloodlust and murderous intent would continuously surge through his mind.
During their recent mission to the Land of Snow, he had brutally slaughtered the Snow Ninja who dared to stand in his way.
The exquisite sensation nearly consumed him, threatening to drown him in its depths.
Fortunately, he had managed to regain his senses in time.
Since he had faced the Snow Ninja alone, his unusual behavior went unnoticed by the rest of Team Seven.
Frowning slightly, Sasuke steadied his mind and resumed his train of thought.
He reasoned that even after making the wish, Monster Satori would still appear.
However, unlike the original timeline, this Satori would possess the Mangekyō Sharingan!
And if his predictions were correct, this Satori's appearance should be...
With a sigh, Sasuke cut off his thoughts, shifting his focus instead to the feasibility of advancing his Sharingan to the Mangekyō stage.
In the original timeline, Satori's abilities could be broadly categorized as mind-reading and immortality.
He could sense any attack, regardless of whether it stemmed from hostility, murderous intent, fear, anxiety, or even positive or negative emotions, allowing him to evade them with ease.
This mind-reading ability was undoubtedly an application of Yin Release.
The so-called immortality, characterized by instantaneous regeneration, initially appeared to be an application of Yang Release.
However, after meticulously reviewing his memories from his previous life, Sasuke concluded that this too was a manifestation of Yin Release.
The immortality displayed by Monster Satori in the original timeline bore a far greater resemblance to the Uchiha clan's forbidden technique, Izanagi, than to Yang Release's regenerative capabilities.
Izanagi uses Yin Release to warp reality, converting truth to illusion and vice versa. It could transform any injury—minor, severe, fatal, or even death itself—from genuine existence into a mere phantom.
This explained why, no matter how devastating the attacks against Satori in the original timeline, he would instantly recover to his original state.
Such a bug-like instantaneous regeneration was something even Senju Hashirama, with his legendary healing prowess, could never achieve.
Beyond the abilities Satori had demonstrated, there was another aspect that perfectly aligned with Sasuke's theory: the four faces carved into the sides of the Box of Ultimate Bliss, each representing one of the four basic emotions: joy, anger, sorrow, and pleasure.
As everyone knew, emotions and the mind were intimately intertwined, to the point where they were virtually inseparable.
In the original timeline, Satori had single-handedly fought Killer Bee's fully transformed Eight-Tails to a standstill, never once losing ground.
Simultaneously, it had withstood relentless attacks and ambushes from Konoha's elite ninja, led by Hatake Kakashi and Maruboshi Kosuke.
Yet even under such overwhelming pressure, Satori remained effortlessly composed.
Furthermore, the Box of Ultimate Bliss itself proved impervious.
Even Naruto in Sage Mode couldn't leave so much as a scratch on its surface.
In the end, Killer Bee's Eight-Tails had to hurl it into the depths of the ocean.
Throughout this ordeal, neither Satori nor the Box of Ultimate Bliss itself showed the slightest vulnerability to destruction.
If the Box of Ultimate Bliss truly was a Ninja Tool left behind by the Sage of the Six Paths, as legend claimed,
Sasuke suspected it might be a Yin Release divine artifact—second only to the Sage of the Six Paths' three great divine treasures: the Sage's Staff, the Sage's Blade, and the Amenonuhoko.
It was an Yin Release divine artifact far surpassing the Rope of the Golden Gourd, Seven-Star Sword, and other such items.
That's why it could achieve such devastating results!
If Sasuke's theory was correct—that the Box of Ultimate Bliss was a Yin Release divine artifact left behind by the Sage of the Six Paths—
then the Box of Ultimate Bliss, imbued with immense Yin Release power, should be capable of evolving ordinary Sharingan eyes into Mangekyō Sharingan.
Moreover, since the Box of Ultimate Bliss inherently grants immortality to its creations,
the special Mangekyō Sharingan evolved through it would essentially be an Eternal Mangekyō to some extent!
While the exact strength and scope of its ocular power remained uncertain, the bug-level abilities of immortality and mind-reading already surpassed the two pairs of Eternal Mangekyō that had appeared in the original timeline.
Beyond this, Sasuke had another objective.
He aimed to completely eliminate all the lingering side effects from merging with Ido Sasuke in one fell swoop.
The Box of Ultimate Bliss inherently possesses the ability to absorb emotions like joy, anger, sorrow, and pleasure, converting them into its own sustenance and power.
After merging with Ido, Sasuke found that unless he consciously suppressed them, a relentless stream of negative emotions—bloodlust, darkness, madness, desire—would constantly surge from within him.
If Sasuke obtained the Box of Ultimate Bliss, he could not only resolve his issues with negative emotions but also transform those emotions into sustenance for the box itself.
To a certain extent, if Sasuke transplanted the so-called Eye of Paradise, the more bloodthirsty his desires grew during battle, the stronger the Yin Release power within his third eye would become.
He could even achieve effects similar to Satori's "Infinite Izanagi" technique.
Sasuke wasn't overly concerned about accumulating negative emotions.
After all, besides these emotions, he also possessed the absolute coldness and nothingness accumulated over countless timelines.
This was precisely the perfect weapon to combat and eradicate negative emotions.
Even Ido Sasuke's primal instincts from the Ten-Tails itself couldn't withstand the void born from endless timelines!
Whenever Sasuke sensed his negative emotions spiraling out of control, he would without hesitation unleash that void to obliterate a portion of them, simultaneously tempering his own inexhaustible coldness and emptiness.
A triple win!
Of course, all of this remained purely Sasuke's speculation—a best-case, ideal scenario that might be somewhat unrealistic.
He wasn't even sure whether the Box of Ultimate Bliss could actually help a standard three-tomoe Sharingan evolve into the Mangekyō.
Until he truly executed his plan, all these mental exercises and theories remained mere conjectures.
Only the day he succeeded could reveal their truth.
Opening the Box of Ultimate Bli wasn't as simple as unlocking it. It required a sacrifice: a massive amount of chakra!
In the original timeline, Mui, the warden of Hōzuki Castle, had opened the box by extracting a portion of the Nine-Tailed Beast's chakra from Uzumaki Naruto's body.
Though only a small fraction, even that sliver might have equaled the entire chakra reserve of Shukaku.
Indeed, the Sage of the Six Paths was notoriously biased!
Therefore, to open the Box of Ultimate Bliss, Sasuke would need to find a sacrifice equivalent to the chakra of a Tailed Beast.
Stroking his chin, Sasuke pondered how to acquire such a sacrifice.
After a moment, an idea struck him!
He slapped the back of his head, grinned, and flashed a cheerful, carefree smile.
When alone, the heart tends to sink into loneliness and emptiness, and emotions grow dull.
To prevent himself from succumbing to this, Sasuke occasionally performed small actions to remind himself of his humanity.
After mentally reviewing his plans for the Box of Ultimate Bliss, Sasuke shifted his focus to another plan.
The Box of Ultimate Bliss and the third eye were long-term goals—actions for two or three steps down the line. He wasn't in any hurry to implement them now; a preliminary plan was sufficient for the time being.
The most critical and urgent plans before him were:
1. Advancing to the Eternal Mangekyō Sharingan.
2. Killing the serpent!
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