Morcaine
"Short of stopping the source of the problem itself, which seems to definitely be Harrowstone, I doubt it. But I may be wrong."
Morcaine thinks back to her training in Lastwall. Was there anything her inquisitor training had taught her about nightmares of this nature?
SpoilerMorcaine makes a Knowledge (religion) check to try and remember anything her training taught her about widespread supernatural-seeming nightmares.
(1d20+7)[24]