Bone Breakers are a type of boggart that feed on the marrow in bones. Mostly they feast on dead animals, but they sometimes acquire a taste for the skeletons of recently buried people, which can be very upsetting for the families of the deceased. Worse still, Bone Breakers sometimes attack the living, wrenching bones from flesh while their victim is fully conscious. These boggarts are sometimes used by bone witches to wrench thumb-bones from the witch's victims and bring them to her.