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Necrophage (from Greek nekros, 'corpse' and phagein, 'to eat') is a hypernym used to refer to monsters that generally haunt cemeteries and battlefields, places where dead bodies lay, eating the remains. Some, however, have decided they have no qualms about being the ones to fill the area with corpses instead of just being carrion crows.
In The Witcher 3, both drowners and drowned dead are classified as necrophages in the bestiary.