A freaky monster from the Bleach manga. A Hollow is a fallen spirit that is born from a regular spirit (plus) that has lingered in the living world after death too long. After awhile, a plus (especially a lonely and desperate one) degenerates into a Hollow. Hollows are huge, freakish monsters with strange masks that hide their identity. They seek out other spirits and humans in order to satisfy their loneliness by eating their souls.
That Hollow just came out of nowhere!