[He gives her a somewhat puzzled look at her tone; by her texts he'd thought she was excited for this, so why the sudden reservation?]

Uh... anything, I guess. Eos has mechs and a few dragon-like monsters but not a combination of both. Are they part-robot, part-dragon, or all robot-dragon? Have they just existed naturally or did someone make them? Are they peaceful or do they attack people? What do they look like?

[He's trying to stay cool about it - again, especially with that tone she'd taken - but it's hard...

...Robot dragons! They just sound so neat.]