[ Her expression conveys her awe and wonder as Aether explains Visions. She has, indeed, noticed Thoma and Diluc's Visions, and perhaps caught a glimpse of Childe's, but it's never occurred to her that they would be the same kind of gem, just... of different types? ]

I see... So those are "Visions."

[ She realizes, then, that there really is so much she doesn't know or understand about the world where they've all come from, and she can't escape the way that it makes her feel like she's failed them, somehow... Her brow furrows and she frowns for a moment, but— right at this moment, at least, there's a warm fire and a new friend at her side, so she can save those thoughts for later. She glances back at Aether and tilts her head, easing back into her curiosity for now. ]

I've seen Thoma and Diluc wield the power of fire, so I assume... the Visions have something to do with that? How come you don't have one, Aether?