Aside from Tsugikuni Yoriichi four hundred years ago, no one has ever left Muzan's presence alive, unless Muzan transformed them into a Demon.
Ubuyashiki Kagaya knew Qingshui was incredibly strong, almost the strongest swordsman after the progenitor of Sun Breathing himself.
But he wasn't sure if Qingshui, even with the help of the other Hashira, could defeat Muzan and survive.
So, after the succession of the Demon Slayer Corps transferred from the Ubuyashiki Clan to the Uesugi Clan, primarily through Qingshui's bloodline, the first priority was to resolve the issue of future heirs.
"As for the third matter, it concerns a personal wish of mine. Cough, cough, please forgive me."
Ubuyashiki Kagaya coughed and said, "Although it might be unfair to Kocho Shinobu, I still hope that if you are still alive in ten years, you will marry both Hinaki and Hinaki. Your children will still bear the Uesugi surname, but you must pass on the succession of the Demon Slayer Corps to your children with them.
The Ubuyashiki name may disappear, but I still hope that the bloodline of our clan can continue to flow. Otherwise, I will have no face to meet my ancestors in the afterlife.
You don't need to worry; children born from Ubuyashiki women who marry out rarely inherit our family's illness."
Qingshui's expression immediately turned strange.
Was this a condition, or a benefit?
And it came with wives?
Not just one, but three, and two of them were child brides!
If this weren't the Demon Slayer World, Qingshui would have tried to check if he was under Genjutsu.
"I don't seem to have a reason to refuse."
Looking at Ubuyashiki Kagaya's expectant gaze, Qingshui spoke.
"So, you agree?"
Ubuyashiki Kagaya asked.
Qingshui merely nodded slightly.
Then Ubuyashiki Kagaya turned to Himejima Gyomei.
"Gyomei, when the other seven Hashira are assembled, I hope that as the most senior Hashira, you will speak up for Qingshui and help everyone accept him."
Himejima Gyomei pressed his palms together and chanted a Buddhist prayer.
"Gyomei will obey, Master. Please forgive my bluntness, but Qingshui-kun has defeated Upper Rank Demons twice, created the Fluorescent Lamp, and mastered the Red Blade. He already commands great respect among the Hashira. If it's him, everyone should accept it.
Once these two effective tools against Demons are widely adopted by the Demon Slayer Corps, greatly ensuring the safety of all swordsmen, everyone will support it."
A genuine, gentle smile once again appeared on Ubuyashiki Kagaya's face.
"Then… I can rest easy."
...
...
Current Fortune Value: Forty-seven percent
In the Naruto World, Qingshui looked at the Fortune value, which had suddenly jumped significantly, and a slight smile played on his lips.
How long had it been since the Marvel Universe was unlocked? The Fortune progress bar had already reached nearly halfway.
Beside Qingshui, the elderly Chiyo also looked with a smile at the prison cell through the glass window.
A Grass Hidden Rogue Ninja clutched his head in agony, letting out piercing screams and constantly engaging in self-mutilation.
It looked somewhat cruel and perverse.
But what pleased Chiyo was that the Fear Toxin Qingshui had proposed was complete.
When Qingshui first brought back the Fear Toxin formula, he tried to replicate it himself.
Its effects were decent on ordinary people or ninjas with low quality and quantity of Chakra, but that was all.
Ninjas generally had high poison resistance. After all, the ninja profession itself was closely linked to assassination and poisoning, and the Sand Village excelled in this area.
Chakra is a blend of spiritual and physical energy, and the effects of poison on both mind and body could be suppressed.
This was like the internal energy in Wuxia novels, but even stronger.
Unless injected in large quantities, Fear Toxin wasn't directly lethal. Its purpose wasn't to kill but to cause widespread chaos.
And to release it on a large scale, it had to be dispersible as a gas, and effective even in relatively small doses.
So, Qingshui asked Chiyo for help.
When it came to Medical Ninjutsu, Tsunade was the strongest in the Ninja World, but when it came to poisons, Chiyo was number one.
Even Hanzo, another master of poisons, was far behind Chiyo because he only used Salamander venom.
Chiyo's various poisons, developed on the battlefields of the Second Great Ninja War, had caused countless troubles for other ninja villages.
Excluding the Delicate Illness Extraction Technique, only Tsunade, who also understood pharmacology, could break down the toxin in a relatively short time.
After receiving the original formula from Qingshui, Chiyo began analyzing its pharmacology and re-compounding it using Chakra-infused materials, until today she produced a finished product with satisfactory results.
"The duration of the drug's effect has exceeded half an hour. According to known intelligence, this Grass Hidden Rogue Ninja was a Chunin from the Grass Village before defecting, and his Chakra levels are not low. This basically means that this poison can effectively and quickly incapacitate a unit on the battlefield."
Chiyo nodded in satisfaction.
"Qingshui, this poison you came up with on a whim is quite good. It completely abandons traditional poison-making principles; truly excellent!"
Chiyo said "excellent" twice, indicating she was genuinely pleased.
It wasn't just about the poison itself, but that Qingshui also possessed the ability to develop new poisons, inheriting her legacy.
"Teacher Chiyo, I think we still need to conduct further experiments. If it's a Jonin with strong willpower, I believe Fear Toxin could still have an effect, but perhaps much weaker. After all, the effect of our toxin is more akin to Genjutsu. If the opponent controls their Chakra flow and uses the spiritual energy within Chakra to resist, and they have strong willpower, there's still a certain degree of resistance."
Qingshui said to Chiyo while writing down experiment notes.
Chiyo first shook her head, then nodded.
"In terms of effect alone, it's already sufficient. Even among all the ninja in the Five Great Ninja Villages, Jonin are one in a hundred. Even if its effect on Jonin and Special Jonin is weakened, it's still enough to incapacitate over ninety percent of the people in a squad. That's already enough to decide the outcome of a war."
"However, we should indeed find a relatively strong Jonin for testing. On one hand, to measure the effect, and on the other, to find someone strong enough to try and extract some antibodies."
At this, Chiyo suddenly turned to look at Qingshui.
"Ahem! Well, Teacher Chiyo, I'm not even fourteen yet, and my body hasn't fully developed. I'm far from strong, you see..."
"What are you afraid of? I didn't say it would be you."
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