[A creature that spread itself unseen like a disease— not so unlike the infected becoming a part of the Illithid hivemind. Something that could not be destroyed because it had no shape of its own, unless one were to find the source. The description she gives is familiar enough to him, and he wishes it was the sort of thing that either of them had only ever read in books, rather than experience some form of it themselves.]

That's quite a formidable foe, to say the very least.

[He can tell from the brief purse of her lips that it's not the sort of tale she shares openly— she has shown herself to be a private person more often than not, but it's yet another piece of the puzzle, another small portion of the larger picture of her life revealed.]

But you managed it— you brought an end to its spread and freed your town.

[That part doesn't surprise him all that much, to be perfectly honest.]