Hollowfication



is the term used to describe the process by which the strength limit of a soul is increased by removing the boundary between Shinigami and Hollow. This allows one to gain tremendous power if one's inner-Hollow can be controlled. A Hollow-like mask appears when entering this state. The result is a Hollow-Shinigami hybrid, or a Visored. The term is synonymous with the act of donning a Hollow mask.

Overview
By gaining the strength of a Hollow, one's Reiryoku increases dramatically. Only those who have control over their inner Hollow can Hollowfy. It manifests itself as a unique mask of different shapes and designs.

When Ichigo's Hollow powers started to increasingly manifest while not under his control, Shinji explains Ichigo's conflict with his inner Hollow is a common symptom other Visored had to deal with at one point or another in order to master their abilities.

Creation Process
The process by which to activate such a transformation can be achieved by three possible methods, though only two are known in any real detail. In any process, the main determination of having achieved Hollowfication is the manifestation of a Hollow mask.

Process 1
Shattered Shaft Training: This process is based entirely on force of will by a normal soul, though with the intention of either gaining Shinigami powers it does not have access to, or failing and becoming a Hollow. Becoming a Hollow-Shinigami hybrid or Visored is an extremely rare occurrence of this process.

When Ichigo Kurosaki's spirit chain was completely eroded, he underwent the normal transformation of a Plus into a Hollow. The significant difference is normally, when a Plus transforms into a Hollow, the spirit form shatters and reconstitutes itself into the new, monstrous form before the mask forms. Ichigo's transformation was entirely out of sequence, as the Hollow mask was being formed first while his body was still that of a Plus (showing he was resisting the transformation). Ichigo entered an internal world where he was forced to find his spiritual powers in a small amount of time. This took place at the exact moment of the final stages of Encroachment. Therefore, it is this singular moment which allowed Ichigo to gain both Shinigami powers and acquire Hollow powers at the same time. It is believed having such a high level of Reiryoku is a factor in this outcome.

Process 2
Unknown Infection: It is unclear how the other Visored gained their current status. What is known is Sōsuke Aizen was instrumental in the Hollowfication process, though whether he knew of the full potential of the results is left to be questioned. The process used seems to spread as some form of possible infection through wounds which has the desired effects on souls with high-level Reiryoku as compared to souls with low-level Reiryoku, causing those infected great sickness and fatigue until they vomit up Reishi in the form of a white liquid, which forms the beginnings of their Hollow mask, which proceeds to transform their bodies and warp their minds. Other than that, all that is known is the process is accelerated by increased stress. The conclusive result makes a Shinigami into a primarily Hollow-like humanoid, which is a highly unstable transformation causing mindlessness and aggression.

Process 3
Hōgyoku: The Hōgyoku possesses the ability to transform a Shinigami into a perfect Hollow-Shinigami Hybrid.

Kisuke Urahara's Hōgyoku played a vital part in the process of making the Visored currently what they are, as he tried to use it to return them to their previous Shinigami state. According to Urahara, what his device did was not what he had intended; instead, the Hōgyoku stabilized the transformation into the hybrids and he considers the solution a failure on his part. They did not become complete Hollows, due to his intervention, and did eventually gain control over their new power.

The Hōgyoku is implied to have had a hand in turning Kaname Tōsen into a perfect Hollow-Shinigami Hybrid. While maintaining all the added benefits of a Visored transformation, Tōsen is notably different in the regard that he not only possessed a Hollow mask, but a Resurrección, allowing him full access to a true sealed away complete Hollow form. The circumstances behind this are yet to be explored in detail to determine if this is a unique situation, or just something not yet seen among the Visored.

Solution
Hollowfication is irreversible, and, if left unchecked, the victim's inner world and the balance with its outer world will be disrupted to the point where the soul destroys itself, a process known as "Soul-Suicide." The only solution to this is to insert into the soul an opposite of Hollowfication. By inserting another object that disrupts the balance of souls and is the opposite of the target soul, the disruption will be balanced and the destruction stopped. To stop the destruction of Shinigami souls from Hollowfication, materials from Quincies will be used. Conversely, inserting something from a Shinigami into a Quincy undergoing Hollowfication will stop the destruction. To balance out the Inner Hollow, a human soul must be inserted. A Shinigami may opt to live in a gigai to act as a sort of tether to a Quincy going through the process, but the Shinigami will lose the ability to use his powers. Urahara claims that this method has worked in 100% of all cases he worked on.

Those who have undergone Hollowfication

 * Visored: The most well-known group of Shinigami who have undergone Hollowfication are the Visored. There are eight members of the Visored, whom were all either former Gotei 13 captains or lieutenants (including Hachigen Ushōda, who was lieutenant of the Kidō Corps, and Substitute Shinigami Ichigo Kurosaki). As Aizen stated, "a normal soul can't contain the prototype" when undergoing Hollowfication, therefore Shinigami of a high spiritual level have to be the ones who undergo this process.


 * Kaname Tōsen: Former Captain of the 9th Division. Turned traitor with Sōsuke Aizen and given Hollowfication for his loyalty. He is noteworthy for being the only known Hollow-Shinigami hybrid with a Resurrección.

Appearances in Other Media
In Bleach: Fade to Black, the beings Homura and Shizuku underwent a different form of Hollowfication, absorbing a Hollow into themselves, and later merged with Rukia Kuchiki to create the hybrid being known as Dark Rukia.

A similar form of Hollowfication occurs in Muramasa during the Zanpakutō Unknown Tales arc as a result of absorbing Hollows to sustain his existence. Both of these forms involved pre-existing Hollows being merged with the individual in question and forced into submission rather than a completely new Hollow being spawned from their consciousness.

In Bleach: Hell Chapter, Hollowfication is noted by several of the Togabito as being capable of liberating them from Hell. The Togabito Kokutō notes the powers of Hollowfication are influenced directly by the atmosphere of Hell, in which, if left uncontrolled, their inner Hollow could proceed to consume them entirely. This is most notable when Ichigo Kurosaki's Hollow mask manifests itself when he attempts to release a Getsuga Tenshō attack.