Testament takes note of how intently Astarion watches their magic- there's a fascination there they cannot fully recognize. It isn't the usual fear of power-hungry sort. No, it is something else. Something that doesn't quite put the Gear on guard...

They do light up very vaguely at the question, though, a faint glint in their eyes, and a small smile. Testament does enjoy discussing the ins and outs of magic. "Ah, this? Magic doesn't have distinct categories on Earth, but I've come to call it blood magic. It is a manipulation of my very life force, supplied by nigh endless energy from my rate of regeneration. I am, ah- magical by nature. It is my being."

Not naturally of course. But that's neither here nor there.