Ok, here's what I've got.
[X] Handle Erina with caution. She may still regard Tavar as a goddess, in spite of being told otherwise. She may simply be trying to get on your good side to protect herself, but she's clearly using her charms to manipulate you. Keep her in her cell most of the time, but make sure she gets some chances to get out each day so she's not feeling trapped. Keep your mental defenses up when around her, as well as the cuendillar chain, and allow nobody to be in the same room with her without you or either Jon or Robb in Shardplate present.
-[X] Her door should be guarded always by two men who know F&V. Preferably ones who are already happily married.
-[X] Teach her about your own religion. Tell her of the Old Gods, the gods of earth, stone, and tree, and their laws, especially the one against slavery.
-[X] Tell her a bit about your prior experiences with demons. How you fought Narsuul and he possessed Red Ronyll, and without giving details about the Hightowers or that you have him bound how you fought off Ithroen's attempt to possess you, about reading the book that gave you details on the Forsaken and their names. "Tavar, the Dreamless" may sound innocuous enough on it's own, but when it's listed as the second among the likes of "Alûthair, The Speaker of Obscenities", "Labarta, The Diseased", or "Dath'riel, The Sin" it doesn't sound so good.
-[X] See if she knows cyvasse. If she doesn't, teach her and play a few games with her. Try to establish a rapport to get her to trust you. And do try not to utterly crush the poor girl if she's a novice at it. Maybe even let her win a game, if barely.
[X] Focus on Drogo. Find out what a Champion of the Gods is.
-[X] Possess a bird or two and do quick scouting runs on Drogo's manse to see if you can find if Ithroen has been taken prisoner. Train Possession to Level 3 so that you can do a longer runs. Use active Acceleration and Focus to speed up the training.
-[X] Continue to have some men discreetly search for Lord Hightower.
-[X] If you have spare time, decipher Illyrio's book.
-[X] Have some of the more studied men search bookstores to find books relating to religion and gods, and anything Occult. Have them bring back lists of titles so you can sort through and find what you want, and then have them purchase them.
-[X] Any other avenues of research Harlon would think of IC.
-[X] Interrogate Viserys. You doubt he knows anything, but there's always the off chance he does. Use the Aura and Control Sequences to try to get him to cooperate.
-[X] Assess whether to wake up Daenerys and talk to her at the end of the first day.
[X] Veracity
REASONING: I feel that we should take an approach of cautious optimism with Erina. She's been a slave most of her life, so she's been expected to obey authority and lying is probably something she was discouraged to do. Her seduction attempts are probably just defensive. Still, if she believes Tavar a goddess we have to be cautious. We can slowly remove the indoctrination and get her thinking for herself, while also simultaneously trying to get her to trust us.
As far as dealing with our current situation goes, Drogo is the biggest possible worry. We need to know more about him. Possession will allow us to scout his manse with birds. We can otherwise research in two other directions - find books, and talk to a priest who might know of such things in exchange for a donation. Hopefully we'll find something doing that.
Thoughts?