Starting as a pirate, he rose to become the strongest Shinigami in Soul Society.

Chapter 507 Aizen and Kisuke Urahara's Hueco Mundo Experiment.

Of course, this is based on the original story's development.

Now, considering the current situation, Bane looked at the Seventh Division Captain, Isshin Shiba, who had also come to join the fun.

Isshin Shiba is Ichigo's father. He was originally supposed to be the captain of the 10th Division, but after a series of events in the human world, he ended up getting married there, giving up his high-paying and stable job in Soul Society, and staying in the human world, which is how Ichigo was born.

Now, let alone whether he will go to the human world to cause trouble as in the original story, it is even very likely that Ichigo's maternal family, the Quincy, was wiped out in the previous Quincy War.

If that's really the case, then why did Kurosaki Ichigo even appear?

It's possible that Uryu Ishida is already gone.

However, the spiritually significant place of Empty Seat should still appear, and it has continued for at least two hundred years.

Just as Bane was thinking about these things, he saw Kenpachi Kuruyashiki rushing back with the Eleventh Division. Without even saying goodbye, they started to squeeze into the portal, as if they were afraid that if they were a step too slow, the Hollows of the human world would be destroyed.

Among the 11th Division members who kept entering the Transcendental Gate, there were many familiar faces to Bane, such as Roronoa Zoro and Sasuke Uchiha.

Furthermore, among the Fifth Division who entered the human world along with Shinji Hirako were Smoker, Waver, and Dol, among others.

This made Bane realize how quickly time had passed; for long-lived beings like Death Gods, decades or even centuries seemed to fly by in the blink of an eye.

The Soul Society's calendar was too terrifying; Bane never used it as a comparison.

After all, the Soul Society's timeline, which is often measured in millions of years, sounds quite convoluted.

It wasn't just him; in fact, most Shinigami were like this. When discussing the past thousand years, they often used the time when Yhwach led the Empire of Light to attack Soul Society as a turning point, because that was the time when the Seireitei officially formed the Gotei 13.

Based on this timeline, nearly eight hundred years have passed since that bloody battle.

Bane has been in Soul Society for almost three hundred years.

Meanwhile, according to the Western Bureau's calculation method, the current year should be 1803 in the Gregorian calendar.

If Bane remembers correctly, Ichigo Kurosaki was born in 1986, which is why he remarked that there are still less than two hundred years until the original Ichigo was born.

Although it may sound like the situation in the human world is quite serious, in reality, the Shinigami in Soul Society aren't very concerned about the situation there.

To put it bluntly, even if we ignore this matter and simply open the interdimensional gate to bring back the 13th Division from the human world, allowing the human world to continue to be chaotic, it wouldn't have much of an impact on Soul Society.

The relocation of the Rebirth Land may take a few days. Those guys in Hueco Mundo can only revel here for a few days at most. In the end, it is the humans in the mortal world who suffer. What does it have to do with the Grim Reaper?

Once the relocation of the spiritual lands is complete, Hueco Mundo will naturally begin to withdraw from the mortal realm, and the unrest will naturally subside.

It was only out of a sense of responsibility to restrain the void and maintain the present world that the Grim Reapers could not turn a blind eye to this and chose to participate in quelling the riot.

Therefore, after watching the Eleventh Division members rush into the human world, Orochimaru spoke first, saying, "Since there's nothing for our Twelfth Division to do here, I'll go and get busy. I have a lot of research waiting for me over there."

"Go ahead. Our Eighth Division will take over the supervision from now on." Kyoraku Shunsui nodded, then called out, "Aizen... Ah, I misremembered. Aizen-kun seems to have led a team to Hueco Mundo for investigation. Damn it, looks like this matter can only be left to my dear Lisa-chan."

"I refuse." Yadomaru Lisa showed no mercy to Kyoraku Shunsui, refusing on the spot while saying, "Let's leave it to Nanao. If she does this well, we should be able to promote her to the fourth seat legitimately."

Kyoraku Shunsui's 8th Division was notorious for having few seat officers; before Aizen joined, there wasn't even a single seat officer.

Aizen joined, which opened up a third seat.

To this day, no one has been promoted to one of the four seats.

Originally, out of respect for Bane, Kyoraku Shunsui was prepared to promote Robin, whom he had carefully considered and ultimately chose to join the 8th Division, to the position of Seat Officer.

But Robin kept refusing, so she's still just an ordinary member of the 8th Division.

Ise Nanao is clearly a potential candidate for the next seated officer. It's not that she is particularly outstanding in terms of ability. In fact, Ise Nanao's combat strength is not strong. Although she has extremely high talent in Kido, she has not yet fully transformed it into strength. At the same time, she has a major flaw: she did not master Asauchi when she was in Shinigami Academy, so she still does not have a Zanpakuto!

Of course, this is a misunderstanding of her by outsiders. In fact, the reason why she cannot master Asauchi is because of her Ise family bloodline, which means she was born to inherit the Zanpakuto, Yakage-no-Tsurugi, passed down through generations of the Ise family.

However, until now, Ise Nanao is unaware of this situation, and Kyoraku Shunsui, in accordance with his agreement with his mother, who is also his sister-in-law, does not intend to say anything more about this matter.

But she is, after all, Kyoraku Shunsui's niece. Even without a Zanpakuto, she had a smooth path ahead. Originally, she planned to join the Kidoshu after graduation, but she was selected by Kyoraku Shunsui into the 8th Division and quickly gained important responsibilities. It seems that she will be promoted to the 4th Seat next.

"Then let's do it your way," Kyoraku Shunsui said after a moment's thought.

Meanwhile, in Hueco Mundo.

Aizen, who was originally in charge of leading the team to conduct daily intelligence gathering, did not act with the members of the Eighth Division at this time. He used Kyoka Suigetsu to create related illusions and then sent them away.

At this moment, Aizen Sousuke and Kisuke Urahara, the third seat of the 12th Division, were standing together on a desolate sand dune in Hueco Mundo.

Not far in front of them, an Adjuchas Hollow, radiating extremely strong spiritual pressure and clearly having reached the Vasto Lorde level, was writhing in agony on the ground.

As the Adjuchas-class Hollow's body continued to mutate, Aizen and Kisuke Urahara appeared completely unfazed, each holding a notebook and taking notes as they observed.

"The increase in spiritual pressure is even more terrifying than last time. Although there is no sign of him advancing to the Vastod-class Hollow, in terms of spiritual pressure, he has already reached the level of the Vastod-class Hollow." Kisuke Urahara noted this down, and then said, "It seems that our power infection experiments on him cannot help Hollows advance to a higher level. This was the case with Gillian before, and it is the same with Adjuchas now."

"I can only say that the advancement of the Great Menos Grande is not within the scope of our research," Aizen nodded in agreement.

Spiritual pressure is spiritual pressure, Gillian is Gillian, Adjuchas is Adjuchas, and Vasto Lorde is Vasto Lorde.

Even if a Gillian possesses Adjuchas-level spiritual pressure, as long as its Hollow nature doesn't evolve, it remains a Gillian and cannot be considered an Adjuchas.

Similarly, Adjuchas is the same. No matter how much spiritual pressure he increases, if his Hollow nature cannot evolve to the Vasto Lorde level, he will still be Adjuchas.

Just like in the original story, Aizen created the Espada, and even hundreds of Arrancars. Many of these Arrancars were stronger than ordinary Adjuchas-level Menos Grande, but many of them were of Gillian origin and did not qualify as Adjuchas.

Among the Espada, the Arrancar Adjuchas is stronger than the average Vasto Lorde, yet he is still ranked as "Adjuchas" in the Hollows' division, and is looked down upon by those Vasto Lorde-class Arrancars.

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Just as Aizen and Kisuke Urahara were observing the changes in the Hollow, the originally chaotic and turbulent spiritual pressure of the Adjuchas-class Hollow began to slowly calm down, and numerous cracks began to appear on the mask on its face.

"The Arrancar are about to begin," Kisuke Urahara said with a hint of anticipation.

Aizen didn't speak, but he looked at the guy with some expectation in his eyes.

Before long, the distortion on the Adjuchas-class Hollow began to disappear rapidly, and the person returned to a normal human form. The mask on his face gradually shattered and peeled away, and soon, an ordinary face was revealed.

It was at this moment that he seemed to feel his spiritual pressure reach an unprecedented level of power, comparable to that of a Vasto Lorde-class Hollow!

This excited him greatly. He turned and looked at Aizen Sousuke and Urahara Kisuke with murderous intent, saying, "Shinigami, I should thank you for the torture you've inflicted on me. It has made me stronger and given me unprecedented, terrifying power. So, to express my gratitude, I will shatter your bones one by one, letting you experience the most painful death."

"Clearly, even after breaking through his own limits and gaining the power of a Shinigami, his intelligence hasn't improved at all," Aizen remarked with a hint of sarcasm.

Kisuke Urahara smiled and said, "Improving intelligence is not within the scope of our research. From his perspective, this time the technique for breaking through the barrier is already close to perfect, with extremely low risk. Apart from the somewhat painful process, it has been successful three times in a row."

According to Kisuke Urahara's words, he, Aizen, and this guy have already conducted three experiments in Hueco Mundo.

Moreover, all three attempts were successful, which means that the technology to break the boundary between Hollows and Shinigami, increase the strength of Hollows, and achieve Arrancar transformation is already quite stable.

As for the pain that occurs during this process? You're kidding! What's a little pain compared to gaining power?

"You two bastards!!! Did you even hear what I said?!" The Adjuchas-class Arrancar, seeing that the two Death Gods didn't seem to take him seriously, roared and charged forward.

Before he could even take three steps, Aizen's Kyoka Suigetsu flashed past his waist, and the Adjuchas-class Arrancar felt a sharp pain as he was sliced ​​in two vertically, blood splattering everywhere, and he died on the spot.

This also shows that Aizen Sousuke's strength has become terrifying. Even an Adjuchas-class Arrancar is no match for him.

"Hiss!" Kisuke Urahara gasped, "You're already this strong, aren't you satisfied?"

"Strong is compared to you guys." Aizen didn't give Urahara Kisuke any face at all, after all, they were already very familiar with each other.

After a slight pause, Aizen said with a hint of helplessness, "Compared to my teacher, the stronger he is, the more terrifying I feel. The gap is still too big, which is why I can't stop moving forward. Otherwise, one day I won't even be able to see his back anymore."

"Comparing like this is pointless," Urahara Kisuke muttered, but instead of lecturing, he retorted, "You idiot, such a good test subject, and you just cut it in half! What a waste!"

"When did you realize that I had cut him in two?" Aizen asked with a sly smile, while Kisuke Okiura raised an eyebrow.

Kisuke Urahara was taken aback for a moment, then his face darkened as he said, "When did you use the Mirror Flower Water Moon technique on me?"

As he said this, he reached out and touched Aizen Sousuke's blade. Clearly, he knew how to break Aizen's Kyoka Suigetsu.

The moment he touched the blade, the world before him shattered, spreading out like a mirror. At the same time, the broken face that had been cut in half remained motionless, standing in place as if dead. Clearly, that guy had also been affected by the 'illusion' and thought he was dead, and it was very likely that he had already lost consciousness.

"Hahaha, just kidding. I should say, when did you get the illusion that I didn't use Kyoka Suigetsu?" Aizen laughed heartily.

It seems that only in front of these like-minded companions, who are at least on par with him in some respect, can Aizen reveal his true feelings and image.

Unlike his usual image as a kind, gentle, and friendly person who is widely praised, he is not the kind person he is usually seen as.

(End of this chapter)