Spiritual beings that reside in the
Rukongai and the spirits of dead humans in the
World of the Living are considered Souls. Those Souls that live in the
Rukongai are often deceased humans, but it is known that Souls can be born within
Soul Society as well.
Plus Souls
Plus Souls, or Pluses, are the benign ghosts in the
World of the Living. These souls tend to be the spirits of people that have died. When the
Chain of Fate, a chain that protrudes from the chest and connects the soul to a living body, is severed, a soul can no longer return to its body and live. When this happens, the soul can move about freely, but the remaining portion of their
Chain of Fate begins to corrode.
Shinigami perform a ritual called
Konsō on these souls to send them to
Soul Society before their
Chain of Fate can corrode significantly and the soul becomes a
Hollow.
Hollow
Hollows are Plus Souls that have lost their heart and in the process become beings of pure instinct. As a Plus Soul lingers in the
World of the Living, its
Chain of Fate is slowly eroded by small months that eat away at the chain. This is an extremely slow and painful process, known as Encroachment, but the final erosion is much more painful and violent as the chain disappears and a large hole is ripped in a soul's chest where their heart once was. The soul's body disperses as spirit particles and then reforms as a
Hollow. The lost heart of the soul becomes the new Hollow's mask as well as their unique appearance and special abilities. Other ways have been found to force
Hollowfication, but the corrosion of the
Chain of Fate is the most common.
Arrancar
Hollows that have removed their masks become
Arrancar, a special variant of Hollow that has Shinigami-like powers and a more humanoid form.
Shinigami
Souls that are responsible for regulating the balance between
Soul Society and the
World of the Living are known as
Shinigami. Their responsibilities entail that they send Plus Souls to
Soul Society through the use of
Konsō as well as fighting and purifying
Hollows through the use of their
Zanpakutō. Some souls have enough spiritual power to enable them to enter the
Shin’ō Academy and become
Shinigami.
Artificial Souls
Mod Souls, also known as artificial souls, were created by
Shinigami scientists to aid in the separation of a
Shinigami's spirit from a
Gigai, or to assist in separating stubborn spirits from their corpses. These artificial souls are contained within small pills called
Gikongan, also known as Soul Candy.
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