That said, the depth of their relationship is only one factor that affects the Zanpakuto's strength—the other one being Reiryoku, or spirit aura ... defected alongside Aizen, and was a loyal ...

What else would you expect from a First Lieutenant? Not all the powerful Zanpakuto are wielded by the good guys. In fact, Sosuke Aizen has one of the most clear-cut yet devastating Zanpakuto in ...