"I didn't expect the failure rate for Hollowfication to be this high. Is it because this world is different?"
Standing in the forest, he surveyed the fifty-odd demons who had undergone Hollowfication. Only five had successfully evolved into Menos Grande-humanoid Gillians infinitely close to becoming Adjuchas. The rest had become powerful Hollows devoid of reason, failures that did not even qualify as Gillians, the lowest class of Menos Grande. The success rate was a mere one in ten, frighteningly low.
After immobilizing these monsters, which could hardly even be called "Hollows," with Bakudō, Aizen looked up at the night sky, where the bright moon outshone the sparse stars. With a trace of emotion, he said, "Even though I extracted the essence of an Adjuchas-class Hollow, it could only produce Gillian-class Menos Grande. This world really is merciless."
Aizen had more or less deduced why those demons had failed their Hollowfication. Those with weak wills were easily consumed by a Hollow's violent bloodlust, becoming mindless monsters.
Willpower was tied to obsession. The more deeply someone cared about something, the more readily it sparked obsession and intense desire. In the Soul Society World, most Hollows were born when excessive obsession turned souls into evil or vengeful spirits.
Hollows in the Soul Society World were evil spirits that had lost their hearts. To fill the emptiness within, they developed a desire to devour human souls.
But the Hollows born in this world, perhaps because its fundamental nature was different, would be reduced to mindless killing machines if they failed to overcome their instincts. They had no potential for growth or practical value whatsoever.
As one of the five fortunate successes, Aono Kōji, who had evolved into a Hollow, was the first to drop to one knee. With reverence written across his face, he