[ A hand comes up to his chin thoughtfully, and he makes a light noise of interest as Kaeya explains the goal itself. He certainly doesn't seem to be horrified by the prospect, but the way his expression stays somewhat tight implies that he's not exactly thrilled either. He's well aware that he's also being evaluated, for one, so he's keeping as neutral as possible until he feels the time is right.

But also, he decides that he won't keep his preconceptions to himself after all. That goal is quite a bit grander that what he was expecting, but it also fits the concept as well. A bit too much for him to think of the name of the substance as just fanciful. ]

And if I may guess, there is a pleroma that seeks the opposite? At least with the interpretations I remember, it would likely be something along the lines of creating "heaven," or life eternal. The concepts go hand in hand, if nothing else.

[ He really is just guessing, considering he doesn't say "pleroma" like it's a proper noun (and honestly probably pronounces it a bit differently than they might expect). Of course a demon finds more than a little entertainment in being quite well-versed in religion. He'd call it a professional interest, really. It's also a useful one, since if he's right, honestly... What a bother. Being embroiled in such a conflict feels a little cliché, doesn't it? ]

...What sort of creature is this Regent? Who are they administering for?