and what is a bankai btw?
its from bleach
The final release is the second and final form of a zanpakutō. To perform it, a shinigami must be able to materialize their zanpakutō's spirit in the real world and subjugate it, giving the shinigami full reign over the zanpakutō's power. Because such an act usually takes hundreds of years of combat experience to achieve, it is rare amongst shinigami and almost exclusively limited to the thirteen shinigami captains in the Gotei 13. Byakuya Kuchiki claims that among the four noble houses of Soul Society, only one person in several generations will be born with the spiritual power necessary to achieve it. Ichigo Kurosaki and Kisuke Urahara are exceptions to this fact. Using a special device created by Kisuke, which forcibly materializes a zanpakutō spirit (thus bypassing the experience portion of the training), they were able to achieve the same result in three days.
After a shinigami is able to materialize and subjugate their zanpakutō's spirit, the zanpakutō can assume its final and most powerful form. Unlike the initial release, there is no command phrase to activate the final release, though the user will usually say "final release" beforehand. A zanpakutō's final release is often a manifestation of the spirit itself, usually creating a massive creature or effect to aid the user in battle (Ichigo's final release is an exception, doing almost the exact opposite). Certain shinigami also change with their zanpakutō, gaining different clothing to fit with the form. Most zanpakutō will also gain additional special abilities. Like with the initial release, most of these abilities have an associated name. Maintaining full release is taxing for the wielder, and cannot be held for long periods of time.
