A waterskin is thrust in front of Astrid's face at this point, the arm that thrust it belonging to a similarly-awed Hermione. She's assuming it's a mix of thirst, hunger, and the depression of marching into the mountain that's made the woman sit.

Or, alternatively, the big blue glowy rock. Thedas never ceases to astound her, surprising her with new things to discover for someone as out of place as a Rifter. (In terms of the Riftwatch, she thinks, she still counts as new.)

"It does look like a heart," she murmurs, hearing the rehearsed line. "Made of lyrium?"