Momo nods understandingly at the way she describes the nomads, because that's about the situation he was imagining. It doesn't seem as if there's a wealth of uninfected areas outside the city, and it sounds like many of the people living out there are infected if soundness of mind is an issue.

Her mention of the Cwyld in the tunnels allows him to circle back around to her mention of the state of the surface, too, expression also becoming a little more serious. "On the surface, infected areas of forest are sometimes burnt to clear it, but that can be dangerous in itself. The conditions near here would've given a terrible impression because the entrance to your caverns is deep into what we call the Wilde, which is heavily corrupted in both plant and animal life. But you may be able to talk to the Coven about leyline purging. It's still somewhat experimental, but we've recently made progress healing a dangerous section of forest by flushing out the corruption with our own magic over a few months. It would have more potential for your tunnels than fire - how close has the Cwyld gotten to the city at this point, and how fast?"

He wonders if the moss would hold out as a defense if the corruption made it that far.