"Yes. Did you lose it or drop it or - something? I can go get it if-" He spots the necklaces around her neck. "Oh, no, it's right there. Okay, er- so, a sphinx gets a medallion that lets them be a false human."

He looks a little uncomfortable, pawing the ground a bit and flexing his wings.

"So um - that sphinx has a child with a normal human. You don't get a hybrid, you get another sphinx, except - the medallion's spell transfers to the kid, too. They don't need a medallion, it's just - on them. But the spell can be disrupted, it's not perfect and if they get a medallion that's - basically - the right frequency, meant for that kind of creature, it tries to turn them human. Except it can't, because you're already turned human, and the spell - breaks. Then you are a sphinx."