One of the Graiai
Enyo is one of the two Graiai, Gray Sisters. The Graiai are the daughters of Keto (Ceto) and Phorkys (Phorcys). They are: well clad Pemphredo and saffron robed Enyo; sisters of the Gorgons and the Hesperides. They were said to have one tooth and one eye between them and when Perseus encountered them he took their eye and tooth and forced them to reveal the location of the nymphs who could supply him with the Cap of Hades (which would make him invisible), a pair of winged sandals (for flying) and a kibisis (a bag) so he could complete his quest for the head of the Gorgon, Medusa. Later descriptions of the Graiai include Deino as one of the sisters. (Theogony, line 270+)
Witch's Well 