"Well, a kumiho won't be satisfied by normal food and drink. They have to kill."
Blossom shakes her head.
"Kumiho are known for their illusions, and taking on human form. But it's hardly their specific...can't say one way or the other just from that."
"You don't know any other details about how you both came to exist?" There could easily be a clue in that, if Jason just knew it.