Bala

is an Arrancar-exclusive technique that hardens the user's Reiatsu and releases it like a swift blast of spiritual energy.

Description
While the technique is not nearly as powerful as a Cero, its speed is 20 times faster and allows for it to be fired in quick repetition. In addition, it possesses more concussive force than a Cero does. A Bala's speed and power varies with the Arrancar using it; while the power of Yammy's Bala is equated with a powerful punch, Ulquiorra's Bala is capable of blasting large holes in enemies.