The estrie is a species of demon from the Hasidic lore of the medieval era. They are considered to be vampiric demons or vampirc spirits and are described as looking like noncorporeal mass of evil that can assume a human female form. These succubus-like demons take up residence in a community to ensure themselves a constant supply of blood. At night the estrie will engage in sexual activity with men, draining them dry of their blood. As long as these demons are able to drink blood and consume human flesh, they will be able to maintain their human form.
If an estrie should ever become injured or seen in its true form by a person, it must eat some of that person's bread and salt or it will lose its abilities and be rendered helpless. Eating bread and salt will also heal any damage that its form has received.
Should a woman ever be suspected of being an estrie, when she dies, her mouth must be filled with dirt, as this will prevent her from rising up from her grave.