Arrancar

Arrancar are a unique class of Hollow that have removed their masks to become even more powerful.

Description
Arrancar are a unique class of Hollow that have - either by themselves or with the assistance of an outside force - removed their masks to become even more powerful. This gives them a much more humanoid form with only fragments of their original mask and a Hollow hole to reference their origins. Arrancar Zanpakuto differ fundamentally from Shinigami Zanpakuto in the fact that they don't contain a sentient spirit: instead, Arrancar Zanpakuto contain their natural Hollow form in a sealed state. Because of this, Arrancar do not use Shikai or Bankai; instead, they use a technique known as "Resurreccíon" to release their Hollow form from their Zanpakuto.

Resurreccíon restores the Arrancar to their Hollow form, albeit with some minor differences, and increases their power phenomenally. The main advantage this provides is that Arrancar don't need to synchronize with an inner spirit - the main disadvantage is that they can't train to make their Resurreccion stronger, and they have to eventually return to human form and reseal their powers to keep their Resurreccion forms fully functional, with the time limit being different for every Arrancar. Arrancar can remain in Resurreccion form past this time limit and can even keep their Resurreccion fully released, but this is a change as absolute as amputating a limb. Also, in their Resurreccion form, their hunger for spiritual energy continually gets stronger and stronger, before eventually becoming uncontrollable.

History
Many Arrancar, including Fraccion, Numeros, Privaron Espada, and Exequias, allied themselves with Zev Raregroove and assembled on Judoon prior to the Battle of Judoon. In the battle, Zev scattered his Arrancar when the Nemesis and the Night Ruby fired plasma bombs at them. Two groups of Arrancar were then sent to attack the enemy ships, but failed. The battle ended when Zev was captured and sent to Impel Down.

In 150,080 CMT, Ynot speculated that his antidermis would mix with Ka-Oni-Santsu's energies if he became an Arrancar.