[Aymr remains where it is, as it was useful both as a torch and a weapon, and she moves forward to stand closer, pushing ahead down the passage and simply assuming he'll follow or move in front. If he does make a hostile move, she'll simply vanish into mist, but she doesn't think he will.]

It does. I've seen signs of the corruption throughout, though not nearly as deep as the surface.

[She looks up at the ceiling, frowning.]

A creeping doom from above. And presumably monsters to spread it further.