Demencia

Demencia (狂気, Spanish and Japanese for "Madness") is an unusual Hollow Technique almost exclusively found among Arrancars of great power, its an innate ability which allows for Arrancar to tap into their depravity to free them of spells, unique affects or generally any other ill-condition set in motion trough the use of spiritual energy or sorcery.

Overview
Upon becoming Arrancar, a select few Hollow find that in their growing depravity and madness, they've chanced upon a new ability; an ability which turns their volatile nature into a tool to use against their enemies. The subconciousness is ultimately what defines a Spiritual Creature; and Hollows are no exception to this - Demencia draws upon this concept by allowing the Arrancar to briefly tap into the deepest recesses of their mind and force their entire being to comply with this, trough what is speculated to be an extremely powerful form of self-hypnosis - this affect lasts for but a short while, but it is sufficient to remove almost any form of ailment that might affect them.

Like any technique though, Demencia demands spritual energy to use; and a rather intimidating amount of it to, which is partially why only very powerful Arrancar make use of it -- the energy it demands rises and falls with the ailment affecting the Arrancar, the stronger and more elaborate it is, the more energy is used getting rid of it.

Drawbacks
Like any powerful technique, Demencia has its share of drawbacks, first and foremost is the route the spiritual energy takes trough the body in order to accomplish its purpose, which is straight to the brain of the Hollow; where it affects the subconciousness directly -- due to this, using Demencia more than twice in any given battle is usually rather risky as the mind can only take so-so much direct altering at any one time. Overuse of this technique often have temporary, but very problematic after-effects, such as slowed down thought-procession, sight dilation, weakened depth-vision and hand-eye coordination.

Useage
Useage of Demencia is split into the Practioner, Adept and Expert suffixes - the skill being reflected in how quickly the user can activate Demencia and how many times they can use it in a day without suffering the side-effects; as well as the maximum amount of energy they can invest in it safely at any one time; and by direct extension, the scale of the effects they can therefore dispel.

Behind the Scenes

 * Demencia is based off an ability used exclusively by Arrancar characters in the game Bleach: The 3rd Phantom, where it is called Dementia - its effects are similiar too.
 * The ability was introduced as an attempt to bridge the rather unfair gap between Shinigami and Hollow; and it can be freely used by anyone as long as the characters are Arrancars of sufficient power.