What is Hygeia?

Hygeia is the daughter of Asclepius (Apollos' son). She's the goddess of good health. In this book she's also an automaton and she's gone haywire, claiming that everyone is unclean and must be sterilized. In her mind, this equates to execution. Leo overcomes her by rewiring her circuitry to where she believes herself to be germ ridden. She explodes.