It seems... Szayelaporro is in a very critical moment.
Has he already embarked on the path to becoming what he considers the perfect life form?
He's indeed in a hurry.
Yoshio looked at the lab door closing again and couldn't help but smile.
Szayelaporro's evolution is a good thing; after all, making friends with Hollows is difficult, but making friends with Arrancars is much simpler.
Although gaining Szayelaporro's favor is bound to be extremely difficult, Yoshio is determined for the sake of the perfect life form ability.
After leaving the lab, Yoshio touched the reagents in his pocket again.
He had packed six bottles of liquid reagents in total, plus a sample of Aaroniero's body tissue.
One bottle to Szayelaporro, some of the rest for Aizen, and finally, he needed to keep some for himself.
Although his research skills were average, he was consciously working to improve them.
To become an excellent ultimate BOSS in the Shinigami world, one must have the ability to innovate and reform.
Aizen created the Hōgyoku, transformed Arrancars, and led Hueco Mundo in a "transcendence."
And Yhwach also granted Quincy Schrift and Vollständig abilities, even developing the Sternritter's ability to steal Bankai.
Well, it might not have been Yhwach personally researching it, but it definitely had some connection to him.
Technological progress is the primary productive force!
Therefore, Yoshio had been studying scientific books diligently, striving to enhance his basic skills in various areas.
With Tōshirō Hitsugaya's 'Kirinji' ability, he even sometimes used it to focus on 'scientific learning' while forgoing training!
Although his research level wasn't very strong yet, Yoshio was still preparing to try it himself.
He even planned to set up a laboratory in Las Noches and his safe house.
After returning from Szayelaporro's place, Yoshio saw Rukia sitting on the bed reading a book.
"I forgot, you used to write novels in Seireitei."
Rukia looked at the book's content and said, "Are you planning to write novels about Hueco Mundo too?"
Yoshio recognized at a glance that it was the adapted Naruto story he had told Lilynette, and smiled, saying, "Hueco Mundo is just too boring; I have to inject some vitality into this dull world, right?"
"What are you planning to do next?" Rukia asked again, "There's still two days, right?"
Yoshio had said he would send Rukia back to the Gotei 13 in three days, and Dark Rukia was about to fall into slumber.
So she was asking how Rukia would handle the remaining two days.
"Three days was just a number I blurted out. Let you and Renji have a good sleep, and then I'll send you back to the dispatch team."
Yoshio didn't care much.
The thing about him impersonating as Yoruichi to take Rukia away was indeed something he said offhand.
Because he didn't know how long Dark Rukia could maintain herself; he just vaguely felt that with the second-generation Hollow White's spiritual pressure, he could awaken Dark Rukia, but after awakening, how long she could last...
That was hard to say.
Yoshio took Rukia away just to figure out what exactly had happened to her and invite her to join his newly formed Espada.
Yes, Yoshio planned to make Dark Rukia one of the Espada.
Szayelaporro was Espada Cero, Starrk was still Espada Uno, Baraggan was Espada Dos—these three positions wouldn't change, but the rankings of the subsequent Hollows would depend on Yoshio's arrangements.
In the original story, Aizen was a perfectionist; he insisted on assigning suitable, distinct aspects of death as the standard for Espada.
For example, Grimmjow and Loly Aivirrne both had "destruction" as their aspect of death, so only one could become the sixth Espada, while the other was directly excluded.
Halibel and Nelliel Tu Odelschwanck both represented "sacrifice," so when Nelliel was the third Espada, Halibel had no suitable stage.
But Yoshio wouldn't do that; moreover, Hollows' aspects of death aren't limited to one.
For instance, Nnoitra had madness, despair, and possibly ecstasy as three forms of death.
Yoshio had always suspected that each Hollow's aspect of death was related to their evolutionary trajectory after becoming a Vasto Lorde or Arrancar, which indeed couldn't be easily changed, but there was no need to be so rigid.
However...
What was Dark Rukia's aspect of death?
Never mind, he'd leave that for Aizen to consider later.
…
About half an hour later, Rukia closed her eyes, and her body began to change.
Her white hemp clothes turned black, reverting to her Shinigami uniform. Her somewhat dull hair turned black again, and her aura gradually returned to that of a Shinigami.
During the transformation, her breathing became a bit rapid for a moment, but after it completed, her breathing stabilized.
Yoshio looked at the sleeping Rukia and cast 'Byakurai' on her as well.
When the time came, he would toss Rukia back.
After instructing Roka Paramia to settle the two, he left the room again.
Because he sensed a familiar spiritual pressure.
He went out and saw Starrk.
Beside Starrk was a massive antelope-shaped Menos Grande.
"Long time no see, Nelliel Tu Odelschwanck, or should I say... Miss Antelope?"
That's right, the one accompanying Starrk was Nelliel!
When she saw Yoshio, she exclaimed in surprise, "It's you? Why are you still in Hueco Mundo?"
"I said we'd meet again," Yoshio said with a smile. "Next time we meet, perhaps everything will be different."
"..." Nelliel frowned, looking around, and asked, "What did you do to them?"
"I don't know why, but my captain became the King of Hueco Mundo," Yoshio said. "It's the Captain Aizen you saw before; he's very powerful."
"...He is indeed strong." Nelliel was silent for a moment, then said, "You... you're not just trying to become the King of Hueco Mundo, are you?"
"Smart." Yoshio extended his hand. "Stay in Hueco Mundo and come with us. If you follow us forward, perhaps you'll see a world completely different from before."
"Hueco Mundo... in our hands, it will change completely."
"..."
Nelliel looked at Yoshio and slowly said, "I have nowhere else to go, but whether I join you or not, I need to see for myself before deciding."