A Prisoner To Oneself (Bleach fanfic)

Bleach fanfic.

Quincy.

Shinigami.

Hollow.

Everyone always thought that there were only 3 types. But there was one more. The Sirens. Sirens were the ones that forged Zanpakutous, the blades that Shinigami used. Marked as too powerful, the Shinigami wiped the Siren race from existence... Except one.