- Zanpakuto Elemental Affinity: None
- Zanpakuto Name: Sono Shiranai [The Unknown]
- Zanpakuto Spirit Appearance: As seen up the top and much like the actual release of the sword, the spirit also possesses no true form. Sono usually takes the appearance of a muscular male with a red tattoo on its left shoulder, its lower half covered by the tattered remains of a Hakama. Its skin is gray and no face is ever seen with the body, if one was to see the spirit face to theoretical face then they may be slightly unnerved by what they see. Even though the spirits appearance is thus, it can also speak and see perfectly fine. Because no true shape is present there is no true gender for the spirit though once again the male preference is usually taken.
- Zanpakuto Appearance:
- Zanpakuto Shikai Activation Statement: Taisan, Sono Shiranai
- Zanpakuto Shikai Appearance: No absolute appearance though when released the sword completely disintegrates, handle and all into a metallic like mist.
- Zanpakuto Shikai Abilities:
* The metallic like mist created from the shikai released has two separate abilities. The first being that the mist itself can act as a weapon and can cut an opponent where ever it touches their skin though the wounds are not overly deep though enough cuts can begin to cause serious problems due to blood loss. Also it can be used as a defensive shield if required.
* The second ability, and Xero's much preferred skill, allows Xero to form the mist into any weapon he can possibly imagine. There is no limit in size for it can rang from a simple dagger to the size of a scythe or Naginata. The mist in Shikai can only create one normal to large sized weapon or two dagger sized weapons, at a time though the weapon can also be broken into parts, for instance if the mist forms into a sword and the sword is somehow broken in two the the broken shard(s) can be controlled separately by Xero's will.
* The mist can also be concentrated onto a certain limb to increase damage such as a fist or metal boots.
- Achieved? Yes
- Zanpakuto Bankai Activation Statement: Senkei Sono Shiranai
- Zanpakuto Bankai Appearance: At this stage of release the Bankai has once again no absolute appearance. The Mist now joins Xero's body and he becomes the mist though some still lingers so his shikai abilities remain.
- Zanpakuto Bankai Abilities:
* The first noticeable thing about Xero's bankai is that the mist now increases greatly in size. This allows for the shikai attacks to still be used though in larger quantity. Up to 5 separate weapons can be formed and controlled individually. The mist itself can also do deeper damage and if used correctly, like Xero obviously can, it could sever limbs if the cut is deep and accurate enough.
* The next ability would be known as Unification. Xero literally joins with his Zanpakuto and is coated in a completely metallic armor though it is like a living organism for it does not reduce movement, speed or flexibility. He basically turns his body into a weapon. Its density being equivalent if not greater then the strongest Heirro. With this unification Xero can now manipulate his limps to change them into any weapon he wishes, ranging for Lances, blades, Bows, Axes. Anything he wishes. The bow section fires metallic arrows created from his body, the metal used for the arrows can be regenerated so if he fires his left arm as an arrow it will grow back. This is not the same though if a limb is severed even in this form. In this form he cannot create the 5 blades for all the mist is used to coat him.
* The final ability requires great concentration but the devastating effects are worth the preparation. Though the mist has increased to the point of being able to make 5 blades, this final move then number quadruples. Due to the increase in mist from this new state Xero can surround the enemy/opponent in a sphere of mist. Then he can create numerous daggers or Shuriken, given their small size an unknown number can be created. These can then be used to stab and wound the enemy with so many small yet deep cuts that it could literally tear an opponent apart in an instant. The draw back being the preparation needed, this means it is basically a last or final ability as said earlier.
- Zanpakuto; Bankai Time Able to Hold: Unlimited
- Achieved? Yes
