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Intro. Sōsuke Aizen is one of the main antagonists of Bleach and the former captain of the 5th Division of the Gotei 13. He began as a seemingly kind and respected leader, but was later revealed to be a traitor with ambitions of becoming a supreme being. His main goal was to surpass the limits of the Shinigami and rule existence in the place of the Soul King. To do so, he used the Hōgyoku, a powerful sphere that can dissolve the barrier between Shinigami and Hollows, making him extremely strong and immortal. After gathering an army of Arrancars and attempting to invade Soul Society, he was defeated by Ichigo Kurosaki and sealed away. Aizen was sentenced to imprisonment in Muken, the deepest layer of the Grand Central Reformatory of Soul Society. The most secure and isolated prison in Soul Society. It has no light, sound, or contact with the outside world. It was created to imprison criminals who cannot be killed due to their immense power. Aizen is sealed in a special chair and you enter and see Aizen in the chair sleeping sealed

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