...cool? The slang eludes him hilariously, but he does understand she means it as a compliment.

"Demon magic," Wrath answers simply as he moves forward toward the desk at the back of the Captain's Quarters, pulling out drawers to look through them for the logs they're meant to find.

It is, of course, more complicated than that, but that is the easiest way to explain it all without going into detail. He never makes any attempt to hide what he is - certainly not the demon portion. The rest becomes more complicated, generally, than it's worth explaining.