Shana
Shana, the current captain of the second squad started to have issues with her powers, as another power started to wake in her again now that her Bankai was mastered. This one was the same power that had cost her issues in the past tied to her nightmares. That wasn't the only change she noticed, she could feel a hollow near her all of the time though there was none to be found. Shana wasn't the only one, other members of the gotei started to look at her wierd because of it too.
After a few months of that Shana had her first slip, her hollow woke up and tore the shit out of the squad two barracks before she managed to get it under control. The entire squad and portions of the seireitei were in a panic as no one knew where a hollow of that strength came from, and why it was carrying a Zanpakuto, when Shana had regained control and heard what happened she knew she couldn't stay. Not as long as she didn't have a handle on what the hell happened to her.
Leaving the Seireitei at that point Shana would start wandering the world after going rogue. Years of this and she stumbled across rumors of someone she knew from her past, her former captain setting up shop in Bogota. He had went rogue decades prior just before she took up the mantle. In fact hunting him was her first task as a captain, and the only hunt she had failed in all her years of service. So here she was reaching out to the only person she knew in this world for help with her new powers.
After a few months of that Shana had her first slip, her hollow woke up and tore the shit out of the squad two barracks before she managed to get it under control. The entire squad and portions of the seireitei were in a panic as no one knew where a hollow of that strength came from, and why it was carrying a Zanpakuto, when Shana had regained control and heard what happened she knew she couldn't stay. Not as long as she didn't have a handle on what the hell happened to her.
Leaving the Seireitei at that point Shana would start wandering the world after going rogue. Years of this and she stumbled across rumors of someone she knew from her past, her former captain setting up shop in Bogota. He had went rogue decades prior just before she took up the mantle. In fact hunting him was her first task as a captain, and the only hunt she had failed in all her years of service. So here she was reaching out to the only person she knew in this world for help with her new powers.