Serafall just smiled upon Aizen's question, "What do you mean?"
"Urahara showed me some of his memories and it looks like he wanted my assistance to deal with that mechanical being trying to invade your world." Aizen paused for a moment before continuing, "However, I've been thinking back to that moment and concluded that that thing does not have a soul. They have something else entirely different. Combining that with its strength, I'll just become a common cannon fodder the moment my ability doesn't work on it."
It was hard for Aizen to admit, but he was sure that his only advantage against the mechanical being that Ophis fended off was his undying body. Everyone in this world could cut through physical objects, however, whether they are a Shinigami, Fullbringer, Quincy, or Witch, they are far more effective against Spiritual Beings.
It's the reason why everyone has to expend a bit more effort against insect invaders.
Yhwach's Almighty may be useful because it's an ability that he uses on himself to see and control the future but that couldn't be said the same for Aizen, 'Against soulless beings, it might be interesting to study them, but I won't accept a one-sided beating.'
"Even if you use the entirety of this world's help, it'll only be a small helping hand against those things. At most, it'll be a standstill because they probably won't be able to do much against those with strong souls. After all, Spiritual Power could only be fully countered by another Spiritual Power..." In the middle of speaking, Aizen had a sudden epiphany. With furrowed brows, his voice trailed, "Unless..."
Serafall's smile disappeared and sighed, 'I guess it's about time for them to be properly filled in. In the first place, they are not a part of this world's defense.'
"Ehem..." Serafall cleared her throat first, "Let me preface this first by saying that we have no intention of controlling your freedom, Sosuke-chan. We know that if we try anything like that, you'd be one of our biggest problems and we don't really like taking on unnecessarily difficult ones."
Aizen was a bit taken aback by the way she called his first name but didn't say anything about it and just continued listening.
"What we really wanted was just letting everyone know of your existence. To explain further..."
Serafall started narrating to them the current state of affairs in the previous world, putting emphasis on the existence of both Evies and Etouldes.
After hearing the bigger picture, Aizen finally understood the role they wanted him to take and spoke while chuckling, "These Etouldes are helping your world but you want a deterrence against them? How I pity them."
"Can you really say in your good conscience that they are only trying to help?"
"Of course not. But this is also only making it worse for you. If they are as large and expansive as you described them to be, then not just the Evies, but you'll also earn the Etouldes' hostility. Even if they are enemies, it's easy for them to decide if your world is worth it or not."
Serafall nodded in agreement, "That's true. But I'll say it again. They are large and expansive. In other words, they are the last thing from being monolithic."
"Hooh..." Aizen understood where her boldness was coming from, "So you're already working behind their frontlines. Hmmm... In that case, I'll be your little scarecrow since I also stand to benefit." He then turned to the silent King of Quincies, "I can do your bidding on a whim, but how are you going to convince him? Don't tell me you're going to control him?"
Serafall shrugged her shoulders, "We honestly thought about that, but the same as you, that's also a bit unrealistic."
Serafall has already heard about Yhwach from the Shinigamis, especially from Ouetsu, 'He's someone who resented how the world works and wanted to remove the boundary between life and death, essentially removing both concepts from this world and letting the souls 'live' without the fear of 'death'.'
She waited to see if Yhwach would say anything but to her disappointment, he didn't say a word.
"Now let's go back to the previous topic. How are these girls doing?"
"They surprisingly learned both Shinigami and Quincy techniques, however, the Zanpakuto releases and Vollständig were still far from their reach." Due to Ophis and Lilith's unusual nature, Aizen thinks that he's going back to his younger days when he drowned himself in his research and felt excited. He's also very cooperative because he has a feeling that observing them could further unlock the potential he didn't know still existed.
'I thought I was almost at the end of my path, but it turned out there's a lot more into it... Urahara, I resent you, but I'm grateful for this opportunity.'
'However, for all of this to come to fruition, Urahara first has to succeed. He charged into that hellhole confidently so he probably has a few things in his arsenal, but I think it's going to be that easy. Ultimately, Hyousube Ichibei won't allow any changes to this world.'
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.
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It had been a few days since Kisuke had descended into the depths of Hell and Ichibei was still sitting on top of the pulsing flesh. He, on the other hand, was still in the distance, but in contrast with Ichibei, Kisuke was lying in his own pool of blood without any sign of his regeneration kicking in, his cane snapped into two, and the blade of his dagger cracked and fractured into a hundred pieces.
"How peculiar. How are you still holding on for your dear life?" Although Ichibei's voice was only at conversational volume, it still managed to reach the distant Kisuke.
Nevertheless, Kisuke ignored him and did his best to stay alive while also asking his tenants, 'Are you guys still intact?'
[...Intact? I was snapped!]
[Consciously speaking, we're still fine, for now.]
'I see. That's good.'
[What's good!? We're at the end of the road!] Benihime shouted in his mind. Although she sounds energetic, there's an apparent weariness in her voice.
'That's true isn't it?' Kisuke coughed out blood as he tried to raise his head to look at Ichibei, 'But he also can't see where he's walking.' He thought with a grin.