We may have had a breakthrough in this. You will have to follow Grurecs report on the "Treasure Hunt" from earlier to know full details of the situation. Great Druid Nanthleenee, your Brother of the Wyvernwood may indeed be aiding this Ariania "Child of Maluradek". We may now know how and why.
In our exit from the Forgotten caves we came across a man, drained of all life and blood with an ecstatic and blissful smile on his face. He had only a bottle of strange smelling liquor. Smell was sweet alluring and revolting all at once. After exiting the tunnel and burning the corpse of the man, we saw a figure covered in a clothing colored of coal and crimson. It is possible that this was Ariania herself. She slinked back into the night like a shadow and we could not pursue her.
The potions had a particular effect on Miss Ottilie after she had smelled the liquor. She seemed "high on life", and more "brazen" in public with there desires. It is possible that if drunk this liquor could force her to seek out Ariania and be under her control. The same could have been the case with Brother of the Wyvernwood Miss Nanthleenee. I will try to research this liquor more, but Ariania has made her appearance to us. It is possible she is being brazen, or wants something from us. Either is cause for concern.