Chinkai

Chinkai (闖解, Forced Release) is a forbidden method of utilizing a 's. Chinkai, living up to it's name, can forcibly activate the final release of a Zanpakutō — the Bankai (卍解, Final Release) — even if the user does not know it.

Usage
The 'Chinkai' is the ability of a Shinigami to forcibly activate the Bankai of their Zanpakutō. Despite the term 'forced', Chinkai merely synchronizes the Shinigami and the Zanpakutō spirit themselves. It operates on a similar principle to 's Tenshintai  (転神体, Divine Transfer Body); in fact, it's from this forbidden method that Kisuke created the device originally. When the Shinigami and Zanpakutō are fully synchronizes, it draws out 100% of the Zanpakutō's power, revealing its true form — the Bankai. While in this state, the user utilizes a 'true' Bankai, the forcible activation does not diminish the power in any way, but bring it out as it should truly be. It is because of this that the cooperation between Zanpakutō spirit and Shinigami are required; a Shinigami and Zanpakutō spirit cannot exist in strife if this method is to be used.

Despite the convenient sounding nature of the technique, it is not without its own drawbacks. Forcibly drawing out the Bankai is disastrous to the user; when the Bankai is activated through the Chinkai method, an explosion of power is released. This massive surge of spirit energy permanently destroys both the ' (魄睡, Soul Sleep) and ' (鎖結, Binding Chain); when the spirit energy runs out, the Bankai will revert, and the user will lose their Shinigami abilities entirely.

Because of this drawback, the method was classified as a forbidden technique upon discovery, and even the Shinigami who know of the technique would prefer to avoid using it due to the consequences.