Chapter 91: Fūinjutsu Design! (Seeking subscriptions, monthly passes, recommendation tickets)
Next to Jiraiya's tent, a smaller tent had been set up as Sarutobi Asuma's office.
Yūhi Kurenai and Shizune became Sarutobi Asuma's secretaries, with a large volume of intelligence pouring in daily.
Sarutobi Asuma sat on the ground, absorbing Natural Energy to recover his Chakra.
Then, based on the intelligence, he dispatched Shadow Clones to support the front lines, stabilize Konoha's defenses, and even launch occasional minor counterattacks.
Might Duy was also nearby, ready to sortie and provide support at any moment.
After all, while Sarutobi Asuma was powerful, the Chakra available for his Shadow Clones was limited.
If the number of Mist Ninja was too great, he wouldn't be able to sustain the fight.
In such situations, Might Duy, a burst-type powerhouse, was needed to provide support.
This was also a reflection of Konoha's current troop shortage.
They couldn't possibly send those fresh graduates from the Ninja Academy to the front lines, to the most brutal combat zones, to wear down the ferocious Mist Ninja who hailed from the Blood Mist Village!
Sarutobi Hiruzen wouldn't allow it, and Sarutobi Asuma certainly wouldn't either!
Three days passed in the blink of an eye.
In just three days, Sarutobi Asuma had stabilized the situation on the Mist 8 Ninja front, thwarting the Mist Ninja's offensive.
However, the Mist Ninja were not to be trifled with, and they quickly changed their strategy.
They specifically targeted areas without Sarutobi Asuma to break through, forcing him to rush from place to place.
As a result, the most brutal warfare between the two sides became the intelligence war.
Both sides engaged in fierce battles for information.
Meanwhile, on the main front lines, infiltration and counter-infiltration were often resolved in an instant due to Sarutobi Asuma's presence.
Either the Mist Ninja squads were annihilated by Sarutobi Asuma, or the Mist Ninja would flee upon seeing him.
However, with Sarutobi Asuma using the Transformation Technique to conceal his true identity, any encounter with his Shadow Clones, unless the numbers and strength were sufficient, carried the risk of complete annihilation.
This also caused the Mist Ninja's losses to skyrocket.
After all, it was impossible for every squad to be equipped with Chakra-sensing ninjas who could determine if they would encounter Sarutobi Asuma before engaging.
Across the vast Mist Ninja battlefield, Sarutobi Asuma was like an unbreakable city wall, making it difficult for the Mist Ninja to breach.
Thus, after a month of high-intensity combat, the Mist Ninja's offensive finally weakened, and the intensity of the war dropped several notches.
Sarutobi Asuma wanted to counterattack.
But even though he could now absorb Natural Energy through his cells, his Chakra reserves couldn't compare to powerhouses like Uzumaki Kushina.
Even if he released the One-Tail Chakra he had stored by unsealing the Yin Seal, it would only be a one-time burst.
Ultimately, he couldn't match Uzumaki Naruto, whose Chakra was endlessly replenished by the Nine-Tails.
Under these circumstances, he had enough to stabilize the defense, but when it came to launching a counteroffensive, he was still lacking.
Unless he directly went to the Village of Kirigakure in the Land of Water and made a bold move, like Uchiha Madara did to subdue the Stone Ninja.
"However, my current strength is not comparable to Uchiha Madara at that time."
"And what limits my strength is Chakra!"
Sarutobi Asuma sighed inwardly.
In his normal state, his Chakra was already vast, surpassing that of his peers and even most Jonin.
But compared to peak individuals like his father, Sarutobi Hiruzen, or Jiraiya, he still fell short.
If he included his Sage Mode, after absorbing Natural Energy, his Chakra could surpass Jiraiya's.
And if he further included the Chakra of the One-Tail released by unsealing the Yin Seal, his Chakra reserves could rival that of the One-Tail.
But as he said, it was a one-time thing.
"Improving my Constitution will take time, but as for Chakra, there isn't no solution."
With the situation eased, Sarutobi Asuma had time to think.
Moreover, there was a ready method available.
The Yin Seal!
He had already studied the human body research materials provided by Orochimaru. The human body had more than just the forehead as a place to seal Chakra.
The heart area was also one of the Chakra distribution points in the human body.
Another location was also commonly used.
The navel, where Tailed Beasts were sealed.
Especially the latter, the amount of Chakra it could store was astonishing.
However, unlike the forehead.
The heart and the abdominal area were the Chakra's transportation hubs, and Chakra would naturally pass through them during daily use.
Here, sealing Chakra means I can't draw it incrementally like before, day by day, accumulating it over time.
The sealing must be concentrated.
"If it were before, this kind of sealing would be useless. I guess that's why the Uzumaki Clan only developed the Yin Seal."
Sarutobi Asuma thought to himself, "I can draw upon Natural Energy now. Even if I seal it all at once, I can seal a large amount of Sage Chakra."
"Moreover, I can add the Double Four Symbols Seal, allowing me to seal a vast amount of Natural Energy to replenish my reserves."
If, in his normal state, his Chakra limit was 1.5 cards…
Then, after his cells absorbed enough Natural Energy, it could reach 3 cards, and this would be Sage Chakra.
Once depleted, it would take Sarutobi Asuma six hours to recover 3 cards of Sage Chakra.
This was his current Sage Mode.
However, if he sealed a massive amount of Chakra in his abdomen, and it was released after his own Chakra was depleted, his cells could be instantly "fed" and restored to 3 cards of Sage Chakra.
To put it plainly.
If Sarutobi Asuma's body were a water bucket, the capacity in Sage Mode would be 3 cards.
The seal in his abdomen would be storing a vast amount of Natural Energy, like a power bank, allowing Sarutobi Asuma to quickly recharge and return to his peak state in a short period.
Back then, when his Chakra ran out, Sarutobi Asuma could only eat to recover. Now, he could draw upon Natural Energy.
This method of sealing and storage couldn't increase Sarutobi Asuma's Chakra limit, but it could improve his endurance.
The Yin Seal, however, was different.
The Yin Seal could store 300 cards of Chakra in a trickle-down fashion, and this could be Sage Chakra, which could then be released instantly, giving Sarutobi Asuma a massive amount of Chakra.
Only with such a vast amount of Chakra could the Creation Rebirth jutsu be supported, allowing for the regeneration of internal organs.
One was a massive increase in Chakra for a short time, the other provided long-term endurance.
Sarutobi Asuma decided to pursue both!
He wouldn't touch the Yin Seal for now; he still had a use for the One-Tail's Chakra.
"First, I need to modify the Yin Seal... preferably so that it can continuously draw Natural Energy from nature."
Sarutobi Asuma immediately created a Shadow Clone to return to Konoha to purchase scrolls.
This place was within the Land of Fire, and with his speed, a round trip would only take about two hours.
During this time, another Shadow Clone had already finished making a simple table and chairs.
Looking at them, Sarutobi Asuma suddenly thought of Yamato.
If Yamato were here, one Ninjutsu would be all it took.
When the Shadow Clone returned, Sarutobi Asuma began to design Fūinjutsu at his desk.
He had previously upgraded the Adamantine Sealing Technique to level 10, gaining a massive amount of knowledge, and had also studied Fūinjutsu with Uzumaki Kushina for several years.
In terms of the sheer number of Fūinjutsu he had mastered, he certainly couldn't compare to Uzumaki Kushina, but in terms of the depth of his knowledge in Fūinjutsu, he now definitely surpassed her.
Over the past six months, Sarutobi Asuma had learned many Fūinjutsu from Uzumaki Kushina, and in return, he had shared his own profound knowledge with her, reciprocating the favor.
Therefore, modifying the Yin Seal was not a significant challenge for Sarutobi Asuma.
The key was whether it could achieve the effects he desired.
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