I think Mostin should go on a little holiday.
I'm sure his wizard brethren don't really want to go to all the trouble of hunting him down and casting imprisonment on him. Even if it was a real big violation of the injunction. If he hides out in his mansion for a couple of years (until the crisis blows over), he should be fine. At the very least, he should hide until he researches Mind Blank (which blocks Discern Location).
Now, what questions should Feezuu ask Demogorgon? I would suggest the following:
1. Did Grazz't or a member of Grazz't's court kill me or have me killed?
No
(so her old associates are not necessarily hostile to her- she might be able to get help from Ainhorr!)
2. Was the individual who spied on me with the prying eyes present at my death?
Yes
(the two incidents are connected!)
3. Did the individual who spied on me kill me?
Yes
(Very closely connected. Her assassin *is* the one who was spying on her.)
4. Did my assassin kill me at the behest of another?
No
(so it isn't the cohort or summoned/compacted ally of her real enemy)
Now the thing is, Feezuu will want to know more about her assassin. If she asks "Is the individual who killed me an outsider?" or "Did the portal recently established near my lair come from another plane?" the answer will be "yes," which will throw her off. (As a 10th level alienist, Mostin is now an outsider, and his study is not on the prime material plane). Two bad she can't simply ask the assassin's name; it would be a one word answer, but not "yes" or "no." Let's say she asks
5. Is my assassin native to this world?
Yes
6. Is my assassin a wizard known to me, either personally or by reputation?
Yes
(She knows it is a spellcaster, since s/he cast Prying Eyes. This spell is not a clerical spell (barring some funky domain, so likely a wizard. A powerful wizard, if s/he could defeat her. And how many powerful wizards are there in the world? She probably knows most of them, at least by reputation.)
Oh, and I have a guess about Mostin's Myopic Emanation. It creates a blurry area around the caster radius which grants progressively greater concealment to creatures more than 5 feet away. Mind you, they get concealment from you, too. But nice for avoiding archers, and you can still use your area attacks. Am I right?
All this was just to *bump* the thread back onto the first page, but I thought I would add some content, too.