Harry has Gargoyles, that doesn’t phase them.
He wouldn’t be happy though to find his young daughter stoned.
Petrified, is the term. Harry's daughter being stoned carries other meanings - one that would be initially funny but actually quite sad and the other is horribly violent.
Not to mention that everyone who looks directly at Medusa is turned to stone... Not really a good guardian..
And the fact Medusa has been killed. Harry was more likely to run into her in his brief time in Hades' Underworld. But yes, Medusa wouldn't be the best guardian of a living being.
All we know is that Maggies baby sitter is a Gorgon, Medusa had two sisters who were immortal, whereas Medusa was not. Hades would not allow a soul to escape, so it was likely the living Euryale or Sthenos, more likely the former as the latter is unduly bloodthirsty.
Euryale is a wife of Poseidon (Hades brother) and mother of Orion, the Giant Huntsman. I do wonder therefore if the Erl King is in fact Orion, and Maggie is being babysat by the Erl King’s mother?
That would freak Harry out.
Well they are the famous Gorgons. It could be a lesser Gorgon that babysits Maggie. Just as there were three Elder Cyclopes and a few famous younger ones like Polyphemus.
Apart from the hunting link, what makes you think the Erlking is Orion? Also, I believe when Orion died he was turned into the constellation. But that could just be embellishment. Still though, if Orion is another form of the Erlking, how many other names does the Erlking have? Who else in history and myth might he have been? We know of course about the Lord Herne connection. But what others might be there?