[Oh, right, magic crystal. At least Indrani's not very good at biology herself, and therefore won't veer wildly off into jargon on this particular subject.]

Um, they get sick from anything. Like, you know, if you get sick once you won't get that same thing again? They just haven't been exposed to anything. I sort of meant to illustrate how cut off they are from, well, everything. Other people, but the animals and the outside, too. To a degree that I find crazy. I mean, I understand would-be tyrants. I even understand hiding out. But this is beyond having a fortress to hide in.