Gorgon
She is Humfrey's fifth wife and mother to his third son Hugo. Based on the mythological Gorgon (most specifically Medusa), her talent is a gaze which turns any living creature to stone. Humfrey has nullified this effect by placing a screen of invisibility around her face and, years later, masking that with an illusionary copy of her actual visage. She was first introduced in The Source of Magic as a danger, but not as a malicious creature.
Read more about this topic: Family Of Humfrey Of Xanth