After exchanging for See-Through World, Naruto directly used skill experience scrolls to max out its proficiency.
The Entry level See-Through World could only provide a preliminary understanding of one's own condition.
Once he reached the Enter the house level, he could clearly see the opponent's flesh, organs, and even minute details like blood vessels and blood flow, and predict the enemy's movements through muscle contractions.
Yoriichi Tsugikuni's See-Through World, if not perfect, was definitely at the master level.
An enemy standing before Yoriichi Tsugikuni had no secrets whatsoever.
Naruto upgraded See-Through World to the perfect level, allowing him to even deconstruct the opponent's magic, Ninjutsu, and genjutsu, and see the rules and secrets of the world.
Combined with Kagura Mind's Eye, it was equivalent to seeing a colored, enhanced Byakugan!
"See-Through World is good. With a perfect See-Through World, perceiving Chakra flow is also an easy matter."
See-Through World + Kagura Mind's Eye = The strongest perception Ninjutsu in the Ninja World.
See-Through World + apperceiving god's rune of wisdom = Any technique can be learned.
"The Underground City shop also has Marks available for exchange, so I'll get those too."
Naruto then exchanged for [Mark].
Activating the Mark greatly enhanced one's combat abilities, but at the cost of prematurely depleting one's lifespan, which is why everyone who activated it died before the age of 25, with only Yoriichi Tsugikuni living past 25.
Naruto considered that his physique was already over a hundred, and as a member of the Whirlpool Clan, he possessed strong vitality, so he definitely wouldn't live shorter than Yoriichi Tsugikuni.
More importantly, once the Perfect Demon King potion was successfully developed,
Naruto's life level would undergo a drastic transformation, with all 160 trillion cells in his body becoming Naruto cells, comparable to or even surpassing Hashirama cells, granting him infinite life and completely ignoring the side effects of the Mark.
Mark stacked with Lightning Release Chakra Mode, and then activating Eight Inner Gates.
As long as his own cells could withstand it and his body didn't collapse, Naruto couldn't even imagine the extent to which his stats would increase. Beating Six Paths bodies should be no problem.
"Let's try it first. Upgrade the Mark to perfect level."
With a wave of Naruto's hand, various experience scrolls were used to increase the proficiency of [Mark].
Upon reaching the perfect level, the Mark activated, and Naruto's calm and steady heartbeat immediately accelerated, like a drum.
The speed of blood pumping was more than ten times faster than usual, and his body temperature rapidly rose, quickly reaching 40°C.
However, it didn't cause his skin to become flushed like when the Gate of Life in Eight Inner Gates was opened due to hyperemia.
It was more akin to Sage Mode, with greatly increased cell activity and accelerated metabolism.
"In that case, the Mark combined with the Perfect Demon King physique will allow regeneration and self-healing to reach an unimaginable level."
Only one phrase came to Naruto's mind: immortal and indestructible!
This immortality and indestructibility was in the true sense of the word.
If Naruto were to deposit some of his Naruto cells into some Shadow Clones, even if his main body accidentally died, the survival mechanism of the Naruto cells' will in the Shadow Clones would activate, allowing him to regenerate and revive.
Unless all of Naruto's Naruto cells were completely eradicated, no one could truly kill Naruto.
"Let's take a look at the attribute panel. That way, it will be easier to understand the attribute amplification."
With a thought, Naruto opened the attribute panel.
[Uzumaki Naruto]
[Race: Human]
[Level: LV44]
[Class: Shadow Monarch]
[Strength: 150 → 500]
[Agility: 100 → 400]
[Constitution: 600 → 1000]
[Spirit: 100 → 200]
[Skills: Rasengan (Perfect), Shadow Sneak (Perfect), Shadow Instant Kill Array (Perfect), Absolute Cube (Perfect), Eye of Appraisal (Appraisal Technique integrated with Miracle "Clairvoyance") (Perfect), Stealth Technique (Perfect), Multiple Shadow Clone Jutsu (Perfect), Gloomy Dark Garden (Perfect), Mark (Perfect), See-Through World (Perfect) —]
[Equipment: apperceiving god's rune of wisdom (Dark Gold), goblin's crown (Gold), hundred dragons battle armor (Orange) —]
[Items: Green Moon Altar (Gold), Ghost Ship (Gold), Transfer Gate — — — —]
[Rating: Peak Kage, strength needs no further explanation]
The arrows on the attribute panel indicated the amplification after activating the Mark.
Among them, [Strength] and [Agility] attributes received the largest amplification, followed by [Constitution], but this enhancement was already quite astonishing.
Now, Naruto, with just his physical body, was comparable to a superhuman existence. When performing taijutsu, unless it was Might Guy or a Sage Body, who could engage him in close combat?
Naruto took out a mirror and looked at himself, finding dark red flame patterns at his temples, extending to his forehead and below his right eye, half-framing one eye, somewhat resembling Yoriichi Tsugikuni's Mark.
"It's not ugly either."
Naruto exited the Mark mode, and the dark red flame patterns on his forehead and eye corners immediately receded like a tide, quickly fading until they disappeared.
After finishing all this, Naruto activated Kagura Mind's Eye, now layered with See-Through World, and began to search for Miss Tamayo's whereabouts.
Tamayo and Yushiro were hidden within a Blood Demon Art barrier, but they couldn't evade Naruto's See-Through World and Kagura Mind's Eye.
The moonlight was hazy, and Kyoto was bustling.
Naruto found a Western-style villa.
"Whoosh"
Naruto appeared on a treetop in an instant, looking towards a brightly lit room on the second floor of the Western-style villa.
Through the window, he could see the warm, yet limited, glow of a kerosene lamp inside a carved glass shade, illuminating an oak long table covered with precise instruments and countless test tubes and medicine bottles.
Miss Tamayo, wearing an elegant kimono over a white lab coat, had a gentle and rational demeanor.
She was focused on recording experimental data, but the moment Naruto entered her perception range, she suddenly looked up,
her purple eyes filled with extreme shock.
"Someone's here? Wait—this aura, is it a Demon!?"
Naruto did not deliberately conceal his aura, and he had previously consumed Kibutsuji Muzan's Demon King's blood.
Only this way could Miss Tamayo utilize the Blue Spider Lily to research an "antidote."
Otherwise, Miss Tamayo would have no reason to create another Perfect Demon King.
Yushiro, like the most loyal hound, instantly flashed out of the shadows and stood in front of Tamayo.
His face was handsome but sickly pale, and his crimson eyes burned with extreme hostility and vigilance towards the intruder.
"Miss Tamayo…"
"Stop! Filthy fellow! Who allowed you to enter this place!"
Naruto had just opened his mouth when he was interrupted by Yushiro's furious roar.
Yushiro, like a black lightning bolt, clenched his five fingers into claws, bringing a piercing shriek that tore through the air, heading straight for Naruto!
Naruto didn't even move his feet.
He merely shifted his body slightly, with a movement so subtle it was almost imperceptible.
Yushiro's sharp claws, capable of tearing steel, swept past, grazing Naruto's clothes with a fierce gust of wind, only tearing through the air.
Their power, speed, and timing were not on the same level at all.
This was a chasm-like difference in strength!!