Re: this, being Celeste immune to the Mentem effect she would be able to guide the rest of her group, and once the group is within line of sight of Dankmar they won't have trouble approaching (of course, the letter gave no details about the specifics of the Mentem spell, so maybe Celeste is not aware of that).
The way things are going do prevent me from tagging along with a few grogs. =[
Unless we want to have someone from Dankmar desperate to get away from there.