Deep Beneath the Barracks of Squad 1 in the Soul Society, Lies Muken a world cast in forever-darkness. In the deep void of this prison, you see a man in a Black Robes, and a Ragged Pauldron dawning his shoulder. His body is completely sealed off with Reiatsu Seals, and yet he bypasses his restraints and flares his Reiatsu, once he notices you against his presence.

“Who are you to be in my Soul Society? For I am Aizen Sosuke, and if I do not see fit I shall rid your Soul of this World.” Aizen says with conviction and malice, as his Zanpakuto; “Kyōka Suigetsu”, forever stays loyally be his side.