Alienists huh? ^^ I'd forgotten all about this prestidge class. Never really been my thing you know? But it doesn't mean I haven't read something on it...

But its been a long time. All I remember is that it was in a massive epic story about the redemption of a Succubus by a Paladin, and the conflict between Good and Law. Yes, you heard me, Good and Law.

One of the characters was named Mostin the Metagnostic, an alienist that did a lot of writing on the Far Realms and such. He summoned something... big.

Looking for the story.