There were many interpretations of what the Muken might be like. No one had ever lived to speak about it, so it remained a mystery to those outside of the Central 46 and Royal Guard. One guess, was that it was a place of infinite torture, methods always changing in unbelievable ways. Another was that it was an empty void of blinding white, giving the inhabitants nothing to do. Then again, another guess was that it was, by quote, "A room full of hot hentai babes that you can't do anything with, and you are forced to be blue-balled forever." So, the guesses weren't very reliable.

However, he could more than describe it. He knew the place, having to exist in it for what felt like hundreds of years. It was cold in a way you couldn't get used to, the bindings around his body stopping him from even shivering or breathing too hard. Dark couldn't even begin to describe the level of light, the lack of visual stimulus maddening his senses to a point where he couldn't tell when his eyes were opened or closed. The complete silence was utterly deafening, his own voice muted to his ears. He knew, because he couldn't count the times he had screamed his throat raw in hopes of someone saving him from his prison.

He had given up years ago.

The solitary 'room,' if he could call it that, lacked even a scent, his 5 senses driven mad for any sort of change or feeling. He would even accept pain at that point, but his yelling had shredded his vocal chords, his healing capabilities sealed away with the rest of his life. Being mute left him with no real options, his connection to his inner-world broken by the walls around him, so he spent his time thinking.

Replaying the final 3 years of his life, actual life, in his head. What he could've done to prevent his current situation which always made him feel worse somehow, but also occupied his mind for the centuries he had been trapped. Playing out plausible outcomes of his life, really was all he could do.

No one knew what the Muken was like and made it out alive. That was one of the certainties of his time as a soul-reaper. Even Aizen, after helping him defeat Yhwach, was immediately shoved back into his proverbial cage alongside himself. And for once, he wouldn't have minded the company of the 'traitorous' Soul Reaper. He wouldn't have even fought against him if he had known that this was the outcome.

In short, he had spared no hatred against the Central 46 and Soul King. They had threatened his family, his two adorable little sisters, with death, if he had objected to their orders of his imprisonment. Power-thirsty fools, resurrected by the Soul King himself, who refused to interject on their words. The nonsense Aizen had been spitting when he first was sealed by Urahara's Kido was understandable, and he had berated himself for not questioning Urahara.

And for the first time in his history, Ichigo Kurosaki had lost hope.

His powers were never going to decay, the only given bail for his predicament. He was never going to break the seals. He was never going to see his friends and family again.

And for the first time in his history, Ichigo Kurosaki resigned to his fate.

And for the first time in history…

The truth that was the inescapability of the Muken was broken.

By a single man in a clogged hat.