Hollow, Bleach Wiki

Hollows (虚 (ホロウ), Horō) are a race of creatures which are born from Human souls who, for various reasons, do not cross over to Soul Society after their death and stay in the Human World for too long. They are corrupt spirits with supernatural powers which devour the souls of both living and deceased Humans. Hollows settle in Hueco Mundo, but can cross over to the Human World and Soul Society. Hollows are the opposite of Humans. Hollow are former Pluses (deceased Human souls) who lose their heart

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