Medusa!

Medusa - The Medusa in Greek mythology, was a chthonic female monster, one of three Górgonas.Era daughter Forcis and Ceto. Anyone who looked directly at her was turned to stone. Unlike their sisters the Gorgons, and Esteno Euríale, Medusa was mortal, was beheaded by the hero Perseus, who there
after used her head as a weapon until giving it to the goddess Athena, who placed it on her shield. In classical antiquity the image of the head of Medusa appeared in the object used to ward off evil known as Gorgoneion.