Board Thread:General Discussion/@comment-13237238-20130724132657/@comment-8986886-20140114153742

Kuir wrote: Bankai: Rather than creating a time dilation field over the targets, Tempora creates a time dilation field over its wielder. This field, however, speeds up time. The Shinigami will move much faster as time is going at a different rate for him. With this, he can be mobile, which the shikai couldn't.

The weakness of this Bankai is its strain on the wielder. As a result of using it to move beyond the rate of those around him by using time, he also ages faster when he uses bankai. The equivalent is one hour within bankai equals one year outside. As such, the use of bankai is reluctant.

Since Shinigami have extremely long lifespans (do they even die of old age?), the sped-up aging wouldn't be that much of an issue, and probably well worth the price paid. A more direct restriction would be if the user's spirit energy replenishment was based on real time, which means the user wouldn't gain any Reiryoku in phantom time while using Bankai, even when subjected to healing Kidô.

Btw, I wouldn't mind having that Bankai, since life is speed, and speed is life. ^^