Set A Several Millenia Into The Future Of The Anime Series. Every Character Is Deceased (And Yes, The Technology Of The Human World Is Somehow The Same ¬¬ ) Thus making this a Non-Cannon Universe.
It has been Many, Many years since the Dispute with Aizen has ended. But the Hōgyoku was taken By the Captain Commander and Sealed somewhere within Sereitei. It's current location is unknown. As the balance of the Universe is Stable, a Wicked mind plots it's next move -
An Arrancar has restored the once, ruined Las Noches back to it's former glory. This Arrancar, Known as Pesadilla, Has Been working in Secret for over 300 Years. He has developed a way to forcibly Progess Hollows through stages. A technique similar to that of the Hōgyoku, but on a much weaker, slower scale.
He has been working in the darkness, and now... The Darkness Will Come..