Empusa
Empusa or Empousa is a shape-shifting female being in Greek mythology, said to possess a single leg of copper, commanded by Hecate, whose precise nature is obscure. In Late Antiquity, the empousae have been described as a category of phantoms or spectres, equated with the lamiai and mormolykeia, thought to seduce and feed on young men.
In antiquity
The primary sources for the empousa in Antiquity are Aristophanes's plays and Philostratus's Life of Apollonius of Tyana.Aristophanes
The Empusa was defined in the Sudas and by Crates of Mallus as a "demonic phantom" with shape-shifting abilities. Thus in Aristophanes's plays she is said to change appearance from various beasts to a woman.The Empusa is also said to be one-legged, having one brass leg, or a donkey's leg, thus being known by the epithets Onokole and Onoskelis, which both mean "donkey-footed".
A folk etymology construes the name to mean "one-footed".
In Aristophanes's comedy The Frogs, an Empusa appears before Dionysus and his slave Xanthias on their way to the underworld, although this may be the slave's practical joke to frighten his master. Xanthias thus sees the empousa transform into a bull, a mule, a beautiful woman, and a dog. The slave also reassures that the being indeed had one brass leg, and another leg of cow dung besides.
The Empusa was a being sent by Hecate, or was Hecate herself, according to a fragment of Aristophanes's lost play Tagenistae, as preserved in the Venetus.
''Life of Apollonius''
By the Late Antiquity in Greece, this became a category of beings, designated as empusai in the plural. It came to be believed that the spectre preyed on young men for seduction and for food.According to the 1st-century Life of Apollonius of Tyana, the empousa is a phantom that took on the appearance of an attractive woman and seduced a young philosophy student in order eventually to devour him. In a different passage of the same work, when Apollonius was journeying from Persia to India, he encountered an empousa, hurling insults at it, coaxing his fellow travellers to join him, whereby it ran and hid, uttering high-pitched screams.
An empousa was also known to others as lamia or mormolyke. This empousa confessed it was fattening up the student she targeted to feed on him, and that she especially craved young men for the freshness and purity of their blood, prompting an interpretation as blood-sucking vampire by Smith's Dictionary of Greek and Roman Biography and Mythology.