...Hah... the spirits. I will say that they haven't been much trouble yet, but we both know that doesn't stay true for long. There have been exceptions, of course, and they caused enough conflict that we had to halt research for a time in order to come up with a way to negate their powers. The less cooperative spirits are a part of the Natural Shifting that led to the barrier's creation.

[He taps his toe meaningfully against the floor, pointed towards the tunnels below.]

And then, of course, there is Twila. An exceptional exception.