Bleach: After Retiring From Zero Division, Aizen Came To Study

This kind of knife is also the foundation for Arima to make a living and become stronger after traveling to Soul Society.

This is the world of Reishi (spiritual particles). When mastering Reishi and delving into their mysteries, the majority of the secrets of this world are no longer secrets to him. Beyond the power present in Reishi, there exists only one other type:

That is...the power of the Spirit King.

The Spiritual King is an existence infinitely close to omniscience and omnipotence.

His power laid the foundation of this world. Even the scattered parts of his body possess various special abilities.

This kind of power is already difficult to distinguish with the ordinary system of reishi.

Strictly speaking, it should be the power of rules and laws.

This kind of power is even more mysterious.

This power is more profound and mysterious, and when it is placed before Zangetsu, who has already unraveled the essence of Reishi, it is filled with great allure.

If he could master such a power and comprehend its mysteries, perhaps it could lead him even further.

This curiosity is precisely what drives him.

When he was initially promoted to the Royal Guard and found himself under the Soul King, so close to him, the desire in his heart became increasingly difficult to suppress.

However, Arima understood that in the Soul King Palace, he had no chance of opposing the Soul King.

Thus, he chose to leave the Soul King Palace and return to the Seireitei.

The Seireitei, while far from the Soul King's location, still held opportunities for studying the Soul King.

This stems from when the five noble families dismantled the Soul King and scattered fragments of him across the world.

These fragments landed in various places—some in the world of Reishi (Seireitei or Hueco Mundo) and some in the world of livings.

In the world of Reishi, Shinigami who possess fragments of the Soul King gain immense and unparalleled power due to the Soul King's strength.

In the world of living, those with Soul King fragments are more likely to become wielders of unique abilities, specifically, Fullbringers.

Although these fragments are just residual power from the Soul King, incomparable to the true Soul King, studying them could still help Arima master the Soul King's power and uncover the mysteries of the world the Soul King created.

By utilizing the freed Zanpakuto, Arima finally succeeded in extracting some power of the ancient Hollow from the blade sealed by the Eight Mirrors Sword. The initially crude Zanpakuto became more refined. By using special methods, a portion of the ancient Hollow's power was sealed within this blade.

Arima's methods allowed him to break this seal and extract a portion of that power.

After extracting it, he restored the Eight Mirrors Sword to its original state. On the surface, the blade appeared normal, but it had already lost part of its power. In its current state, it was akin to a Zanpakuto that had been broken during Shikai, incapable of fully restoring itself through Shinigami power due to fundamental damage.

In the future, the blade might still be usable, but it would no longer carry its original might.

Nevertheless, this weapon was not intended for combat against humans in the first place. It inherently lacked the capability to harm humanity.

Only divine power on par with the ancient Hollow's could unleash its potential.

…

Time passed.

It was quiet. During this time, Shunsui Kyōraku had been chatting idly with his sister-in-law.

They weren't sure whether Arima could uncover the source of the Kyōraku family's curse, but they didn't have high hopes to begin with. It was better to let Arima give it a try.

Suddenly, a fluctuation of Kido energy swept through.

The barrier in the room was lifted.

Shunsui Kyōraku abandoned his casual conversation with his sister-in-law and looked toward the nearby room.

The door opened, and Arima emerged holding the Ise family's Eight Mirrors Sword.

"Senior Arima, how did it go?"

Arima handed the Eight Mirrors Sword back to Ise Isuzu and explained to her, "There is indeed a powerful force within the Ise family's Eight Mirrors Sword. This blade is extraordinary. It is intricately linked to the bloodline of the Ise family—only someone from the Ise family can wield it properly."

"But the curse of the Ise family did not originate from this sword!"

"!!!" Ise Isuzu frowned, of course she could understand what he meant.

In other words, even if the sword is abandoned or even destroyed, the curse of the Ise family will always exist.

This is not good news.

Arima explained a few more words, "If my guess is correct, the curse of the Ise family should originate from the existence that this sword killed in the past."

"According to what you said, it is a sword specifically aimed at gods. Perhaps it was a certain god who was killed by this sword of the Ise family in the past. Out of resentment, he planted such a curse on the Ise family."

Arima did not say who the god was.

Deep down in his heart, he actually already had the answer.

Besides the Spirit King, who else could it be?

As far as he knew, there was only one person in this world who could influence others through blood ties, and that was the Spirit King.

All Quincy are descendants of Yhwach. Yhwach is the son of the Soul King, which is why he can activate Auswählen—forcibly absorbing the powers of all Quincy through the connection of their bloodline. Even the Schrift engraved within the Quincies is reliant on his soul and blood.

Although the Soul King has not shown such abilities, he too can influence those with Quincy bloodlines, subtly manipulating Ichigo Kurosaki to come to the Soul King Palace and stand before him.

"But you don't need to worry too much. Although the curse cannot be lifted immediately, now that we've figured out its origin, perhaps a solution to dissolve it may emerge in the future," Arima reassured Ise Isuzu.

Ise Isuzu could only nod silently.

At this point, what else was there to say?

She could only accept this harsh reality.

Fortunately, Nanao was still young, and before she grew up, there was still time to attempt to break the curse.

Although she had no idea how to lift a bloodline curse, for her child's sake, she had to try—no matter how slim the chance.

Arima also gave Ise Isuzu some warnings. "Although the Ise family has not ventured to the Seireitei, as far as I know, your clan is quite unique. Many families may be secretly monitoring you. Therefore, if possible, it's best to keep this blade tightly secured in your own hands. Do not lose it. The blade itself is not the source of the curse."

Arima issued this warning because, in the original storyline, Ise Isuzu, in an effort to prevent the curse from being passed on to her daughter, entrusted the blade to Shunsui Kyōraku for safekeeping. However, as a result of losing the Eight Mirror Sword, she was sentenced to execution and died.

During her execution, prominent noble clans like the Tsunayashiro family played a significant role in orchestrating her demise.

The former event occurred in the manga's storyline, while the latter was inferred from a few brief descriptions in the novel.

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It seems like the original Author also took some Infos from the novel of Bleach so let me know if you need further clarification!