Resurrección

Arrancar, are Hollows that have removed their masks and gained Shinigami powers, have Zanpakutō and can perform something similar to a Shinigami's release called. Unlike a Shinigami's Zanpakutō, however, an Arrancar's Zanpakutō is simply the Arrancar's Hollow powers sealed into the shape a of sword. By releasing their Zanpakutō in the same manner as a Shinigami, an Arrancar can release his or her Hollow powers.

Because their powers are sealed in their Zanpakutō, an Arrancar's release will usually transform some or all of their body into a Hollow-like form, allowing them to use their abilities freely. This form usually reflects what the Arrancar looked like as a Hollow, although to highly varying degrees. Arrancar normally only return to their human form when they reseal their Hollow powers; doing so without resealing, though possible, is a permanent change comparable to amputating a limb. The reason Arrancar go through such trouble to seal their power is twofold: it allows them to maintain human form and conserve their power in times of inactivity.