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Hueco Mundo

The hollows are a race of evil spirits who feed on the souls of humans, both living and dead. Hollows are created when the soul of a dead human is neglected by the Soul Reapers until it is overcome by loneliness and/or rage, at which point it changes form into a monster with a white mask. By going through a procedure provided by Aizen, they become an arrancar, a hollow which regains the ability to reason, obtains a more humanoid form, and can gain access to Soul Reaper abilities such as the zanpakutō. As a group, the arrancar are the primary antagonists of the Bleach series. When not hunting humans or souls in the human world hollows reside in Hueco Mundo (虚圏(ウェコムンド), Weko Mundo), a dimension between the human world and Soul Society. Hollows are undetectable as long as they remain in Hueco Mundo.