Gorgons

In Greek mythology, the Gorgons were three monsterous sisters who had hair of living, venemous snakes, and a horrifying gaze that turned those who beheld it to stone. Traditionally, while two of the Gorgons were immortal, Stheno and Euryale, their sister Medusa was not, and was slain by the mythical hero Perseus.

Gorgons in "Miss Manners Guide to Greek Missology"
The Gorgons (Cindy, Claudia, and Tyra) were three unnaturally beautiful women, whose charms were growing problematic for the Olympian gods. Zeus tasked Andromeda with putting a stop to them. Andromeda, while reluctant, agreed. Zeus and Hera gave Andromeda a magic shield, which would show deformed reflection of whoever gazed into it.

After obtaining Hermes magic sandals, Andromeda tracked the Gorgons to Rome. After using the shield against their agent, the Roman goddess Victoria, Andromeda utterly destroyed the Gorgons self-esteem, showing them their reflection and pronoucing them as "plain, mousey, nondescript". The Gorgons agreed not to return to Greece.