Transcendent

Transcendent (超越者, Chōetsu-sha; literally "Transcendental Being") beings are that have broken through the limit (限界, Genkai) imposed upon them by their own individual existences. All souls exist within an existential dimension all their own, a limit imposed upon them by god; a destiny or fate, so to speak, as to how far they can evolve. Because of this, there is only so much that they can accomplish on their own. In order to achieve heights that surpass these innate limits, they must tear down the boundaries that separate their existential dimensions from others. It is believed is one possible route toward becoming a Transcendent being.

Overview
It is said that all beings possess an innate capacity for evolution. No matter what existence they are, they are restricted to that existential dimension. That is their destiny; their fate. Whether one can consider this a good or a bad thing is debatable. Existing within fate meant that one was a prisoner of fate but also being protected by fate as well. They could only stray so far from a drawn path and avoid being lost to the turbulent chaos of this world. It is the equivalent of those who have faith in a higher power to protect and save them as their god. It is believed that the created the various existences —, , ,  — and kept them divided in order to preserve balance in the world. That every being be content to live within the boundaries drawn by fate. But there are those that are not satisfied with remaining within the confines of destiny. They are the ones that ignore god's warning and step outside of fate. That is what is referred to as a Transcendent being.

Stepping outside of the boundaries imposed by one's existential dimension enables one to shatter the limit of their own existence and achieve power beyond those limitations. In order to do so, one must manage to first reach the limit of their own existence, and then find a way to reach past the boundaries into the realm of other existential dimensions. is a prime example of this. When learning to harness the, he had "become the Getsuga". In other words, he had momentarily broke through his own limit as a Shinigami by perfectly merging together with his which contained the already-fused powers of a  and a. One could even say that Ichigo had reached the end goal of Hollowfication by achieving a perfection harmony through the fusion of a Shinigami with a Hollow. When had managed to break through the boundaries of his own existential dimension as a Shinigami through the power of the, he had achieved an existence that was beyond either Shinigami or Hollow, and had ascended to the realm of a god.

While the most significant aspect of becoming a Transcendent is to reach into an existential dimension beyond one's own, it is possible to break through these limits by one's own efforts. is an example of this. Through — namely the third realm of Hakuda,  — the soul expands and opens up beyond its imposed capacity. Those Hakuda masters that can reach into this state can themselves evolve into Transcendent beings, achieving an existence rivaling that of a god. masters can also reach similar heights through a process similar to Ichigo Kurosaki, where they have managed to perfectly merge with their Zanpakutō and used them to shatter the boundaries surrounding their own existences. Aizen himself had theorized that perhaps this fused form is in fact the original form of the Zanpakutō, in which the sword is literally merged to the Shinigami's hand.

Characteristics
The nature behind a Transcendent being is often different depending upon the individual and the process in which one has broken their existential limits. One shared feature, however, among all Transcendent beings is that they have achieved which cannot be sensed by beings that remain within their existential dimensions, unless the Transcendent being themselves permit interference by lower beings. As Aizen explained, by achieving evolution into a dimension separate from Shinigami, both Shinigami and Humans have become unable to feel his spiritual pressure unless he voluntarily lowers his level and allows them to interfere; in the same way that a two-dimensional being is unable to interfere with a three-dimensional being.