Arima had expected that Yoruichi might inform Urahara Kisuke about the philosophy behind Shunkō.
He didn't stop it either.
In fact, he never explicitly told Yoruichi that Shunkō couldn't be taught to outsiders.
Even if Urahara Kisuke learned about Shunkō, Arima didn't care much.
Truthfully, he did it on purpose.
Although he hadn't interacted much with Urahara Kisuke, his familiarity with the original course of events told him that Urahara Kisuke and Aizen were essentially the same type of person—both were naturally curious about the world and driven to uncover its secrets.
This was evident when Urahara Kisuke inadvertently created the Hōgyoku.
The only difference was that after learning the truth of the world, Aizen chose to confront it, trampling the existing order to create a new one.
Urahara Kisuke, on the other hand, chose to step back, stopping before going too far. He acted as a bystander, refusing to actively interfere or destroy the world's order—in fact, he even worked to maintain it.
But that was Urahara Kisuke in the future.
Right now, Urahara Kisuke was still young—young enough that Arima didn't believe he could resist the temptation of unraveling the many hidden truths of the world.
Arima was looking forward to seeing what kind of surprises Urahara Kisuke could bring him.
It might have seemed like Arima didn't pay any attention to Urahara Kisuke, but in reality, he had been keeping a close eye on him.
Shunkō was just the beginning.
Yoruichi passing Shunkō's principles to Urahara Kisuke meant that he would undoubtedly start researching its mysteries.
As more knowledge flowed from Yoruichi to Urahara Kisuke, would he pretend to ignore it, or would he succumb to his curiosity and explore it further?
At some point, Arima found himself becoming unexpectedly busy.
Researching the Quincy and the Spirit King's power alongside Aizen went without saying—this was part of Arima's own pursuit of the world's mysteries.
Previously, he would occasionally visit the Fourth Division to chat with Unohana Retsu as a change of pace.
But now, he was also assisting Kirio Hikifune with her research in the Twelfth Division and tutoring Yoruichi at the Shihouin estate.
These were things Arima never imagined himself doing before.
"Speaking of which, do you think I should buy a house?"
Arima asked Aizen casually, watching him focus on his research.
Time flowed strangely in this place.
A few days spent here amounted to only a brief moment in the real world.
Thanks to Kyōka Suigetsu's ability, Aizen—now the Fifth Division's lieutenant—could still manage to slip away unnoticed, despite Captain Hirako Shinji keeping a close watch on him.
Compared to Aizen, Arima had far more freedom.
He only taught two classes a month and spent most of his time leisurely.
Before Aizen arrived, he had been conducting research alone. After Aizen joined him, he let his student take over while he relaxed.
It wasn't that he was lazy—he simply preferred efficiency.
"Why would Master have such an idea?" Aizen asked, looking up from his research.
After spending years together, Aizen and Arima had become extremely familiar with each other.
Their relationship had grown beyond master and apprentice, feeling more like a close friendship. Their conversations had also become more casual over time, as Aizen gradually understood Arima's personality—he was someone who followed his whims.
"It's just that there's too much going on right now," Arima replied.
"Living at the Shin'ō Academy forever isn't ideal. Having my own place would make things much more convenient."
Aizen strongly agreed.
The Academy was the heart of Soul Society's future, closely watched by the Gotei 13.
Unlike Arima, who could use Kyōka Suigetsu to conceal himself, Aizen had to be more cautious. Staying at the Academy for too long increased the risk of exposure.
Getting his own residence would make it easier to move unnoticed.
"Do you need my help, Master?" Aizen offered.
"I can try to find a suitable place for you."
Arima shook his head.
"No need. I have someone else in mind who's more suited for the job."
Aizen nodded and returned to his research.
The Quincy's power centered around their blood, much like how the Shinigami's strength revolved around their Reiryoku flow.
For the Shinigami, the Saketsu (binding chain) was the core of their spiritual energy.
For the Quincy, their blood held the key to their ability to control Reishi.
Their blood contained a unique power that granted them extraordinary affinity with Reishi. The purer the bloodline, the stronger this ability became.
Through analyzing a member of the Sternritter with an engraved Schrift, Aizen made a shocking discovery.
Within the Quincy's heart, he found a small amount of blood far purer than the rest—just a few drops. Yet those few drops contained power that surpassed the Quincy's own strength.
Those few drops of blood seemed to be actively draining the Quincy's power, weakening them.
Arima provided the answer.
"This should be Yhwach's Soul Blood."
"All official members of the Sternritter have consumed Yhwach's Soul Blood at some point."
"Soul Blood acts as a key, granting them evolution, engraving their Schrift, and allowing them to steal Bankai from the Shinigami."
"It also grants them a unique power exclusive to them."
"But what gives also takes away."
"When Yhwach is weakened, the Soul Blood draws power from them to sustain him. In fact, if he wishes, he can steal their strength entirely—even their souls."
Aizen was momentarily stunned before nodding thoughtfully.
It made sense.
The Quincy's blood was the vessel of their power, and naturally, the blood of a superior would hold dominance over an inferior's.
Aizen considered the implications.
"Any Quincy who possesses Yhwach's Soul Blood can have their power and soul taken away by him. If I remember correctly, Master, you once told me that all Quincy are Yhwach's descendants. That means…"
"Yes," Arima confirmed.
"If necessary, Yhwach can take back all Quincy powers—returning them to himself."
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