A gorgon

"A gorgon!" Diana explained. "Why do you have a gorgon down here, Persephone?"

"Hey, they all gotta go some place," said Persephone. "By the way, you probably should not look at her. I know that a goddess like me is immune to her appearance but a human like you -- Oops! Too late! Oh, well. I could always use another nice naked statue."

Diana, of course, was in no position to reply...