Returning to the main camp, Yōkō immediately began researching a Chakra Storage Technique similar to the Yin Seal.
The Uzumaki clan's Yin-Yang Sealing System was built upon the foundation of Yin Release and Yang Release chakra.
Only through the mutual generation of Yin and Yang, interlocked in a cycle, could a stable equilibrium be achieved.
Yōkō extracted Yin Release and Yang Release chakra, forming them into a vortex resembling the Taijitu symbol (Yin-Yang fish).
Due to their special mutually-generating Yin-Yang properties, the Yin and Yang chakra stably rotated around a central point, forming the most rudimentary sealing space.
The rotating Yin and Yang chakra formed the boundary and containment of the seal, while the space in the center was the seal's core.
This was the simplest Two Forms Seal.
Yōkō tried injecting chakra into the Two Forms Seal.
The chakra didn't dissipate immediately but gathered within the seal.
However, the seal structure was too simple and weak; the chakra slowly faded away.
Especially upwards and downwards, perpendicular to the plane of the Two Forms Seal, the chakra was unconstrained, shrinking like a date pit.
Seeing this, Yōkō tried adding a vertically oriented Two Forms Seal to the horizontal one.
Four streams of chakra appeared in his palm.
At first, he was unskilled; the horizontal and vertical chakra streams collided, causing the seal to burst apart.
Yōkō tried again. This time, he deliberately controlled the horizontal and vertical Two Forms Seals, allowing the chakra to rotate through each other's gaps without colliding.
When he injected chakra into this combined seal, the rate of dissipation was much slower.
The chakra was constrained within the two Two Forms Seals, bounced back and contained by the stable seal structures.
However, the Two Forms Seal itself was a relatively weak seal. Continuing to inject chakra, the power of the chakra exceeded the seal's capacity, and the entire system collapsed and dispersed.
No good. Sealing techniques based solely on the Two Forms Seal are too structurally simple and cannot meet the requirements.
The Four Symbols Seal was an enhanced version of the Two Forms Seal.
The Four Symbols Seal was extremely stable, far stronger than the Two Forms Seal.
Yōkō attempted to use Greater Yang (Taiyang) and Greater Yin (Taiyin) to replace the horizontal Two Forms Seal, and Lesser Yang (Shaoyang) and Lesser Yin (Shaoyin) to replace the vertical Two Forms Seal.
Greater Yang consisted of two streams of Yang Release chakra, Greater Yin consisted of two streams of Yin Release chakra. Lesser Yang consisted of one Yang and one Yin stream, and Lesser Yin consisted of one Yin and one Yang stream.
In other words, this seal was composed of 8 streams of chakra.
These 8 chakra streams could not collide and annihilate each other, and their speed could not be too fast or too slow.
The complexity of the seal structure instantly increased.
Just constructing this new seal took Yōkō fifteen days.
Fifteen days later, Yōkō finally succeeded in constructing the entirely new seal.
This seal could stably store chakra. Yōkō tested it; with the version he created now, the amount of chakra stored could be used to fully power five jutsu.
This meant that in battle, he could start by unleashing five large-scale jutsu to gain the initiative.
Yōkō named this sealing technique the Cross Seal.
He hadn't expected his own talent for sealing techniques to be quite good.
He immediately summoned Black Gorilla.
Black Gorilla entered the squad leader's tent, puzzled about why the Captain had called for him.
Yōkō said, "Black Gorilla, you are 23 years old. I've observed that your chakra reserves haven't increased for three months.
In the last battle, you even experienced chakra exhaustion."
Black Gorilla's eyes dimmed.
He had discovered three months ago that no matter how many hours he trained daily, he couldn't increase his chakra reserves.
Correspondingly, his taijutsu and ninjutsu had also reached their limits.
"Don't be too anxious," Yōkō said. "I have some ideas. Cooperate with me, and let's try together. We might be able to solve your strength ceiling problem."
"Really? Captain, is there still hope for me?"
"Of course there is hope." Yōkō first asked, "Come here. Let me check if you have any Yang Release or Yin Release chakra aptitude."
Yang Release and Yin Release aptitude were rare talents, not possessed by everyone.
Yōkō examined Black Gorilla and found that he could sense the Yang Release chakra Yōkō channeled into the back of his hand, but he couldn't sense the Yin Release chakra.
"You only have Yang Release chakra aptitude..."
What a pity. Black Gorilla cannot learn the Cross Seal by himself.
But Yōkō had another method.
Yōkō formed hand seals, completed the Cross Seal, and pressed it onto the back of Black Gorilla's hand.
A cross-shaped cursed seal, covering the entire back of his hand, appeared on Black Gorilla's skin.
The center where the cross intersected was empty.
The four arms of the cross represented the cursed seals for Greater Yang, Greater Yin, Lesser Yang, and Lesser Yin.
"This is also my first attempt; I don't know how effective it will be. In the coming time, we will work together to refine this sealing technique.
Black Gorilla, try injecting chakra into the seal."
Black Gorilla extracted chakra, concentrating it on the back of his hand.
His chakra disappeared!
He felt the back of his hand grow warm; the cursed seal was taking effect.
The cross of the seal began to spread out, slowly approaching a diamond shape.
Yōkō thought to himself, No wonder Tsunade's Yin Seal is a diamond mark; her seal structure is probably more mature than mine.
But the one he developed himself was the most suitable for him.
He knew every step of the seal, understood the principles, and could explore improvements on his own.
"Come on, let's go to the training ground!"
After arriving at the training ground, Yōkō said, "I'll teach you a hand seal. You can use it to open this seal."
Memorizing the chakra pathways, Black Gorilla imitated Yōkō and performed the hand seal.
The back of his hand grew warm again!
The chakra stored within the seal rapidly flowed from the back of his hand into his body!
Yōkō said, "Don't extract your own chakra; try using this chakra."
Hearing this, Black Gorilla formed seals and used Earth Release: Earth-Style Rising Spears.
Four earthen spears erupted, colliding in the center, simulating impaling an enemy from different angles.
"I... I! I didn't extract chakra; I used the chakra from the seal?"
Black Gorilla was ecstatic. His chakra problem was solved!
With this seal, it was like carrying a jutsu scroll, but even more practical and convenient.
After three consecutive days of training, Black Gorilla finally became proficient in using the sealed chakra.
By releasing the seal, Black Gorilla could use five jutsu.
If he concentrated the chakra, he could even surpass his level and use one Jōnin-scale jutsu.
Black Gorilla said, "Captain! I'm a Special Jōnin, but it's like I have an extra Jōnin-level jutsu as a trump card! It's too powerful!"
Yōkō nodded repeatedly, very satisfied with the seal's effect, and said, "Black Gorilla, the power test for the Cross Seal is over. Next is the stimulation experiment."
"Stimulation experiment? Stimulate what?"
Black Gorilla grew even more excited. Did this seal have other effects?
Yōkō said, "Fill the Cross Seal with chakra, then wait until your body and chakra have fully recovered. After that, release the chakra from the seal.
I want to know if your body, after being subjected to chakra exceeding its normal limits, will undergo any changes, if it will allow you to continue growing stronger.
This experiment is dangerous. We must proceed step by step, slowly increasing the chakra stimulation."
Black Gorilla's gaze was firm. Having one Jōnin-level jutsu as a trump card was already excellent.
If he could also enhance his inherent strength through the stimulation of large amounts of chakra, it would be a transformative change for him.
***
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