Quote Originally Posted by Sinfire Titan View Post
People under the effects of that spell in Complete Mage that turns you into either a Barghest or a Yeth, I can't remember which.
This could make an interesting hook, actually.

PCs get hired by some studious wizard who doesn't like to take chances on his own health, so he's practicing the spell thats name I can't currently remember on willing participants, in exchange for a small sum of gold.

So the PCs take up his offer, and are transformed into the above creatures. During their transformation, pop, they seem to have been summoned to the services of a demon lord. In the following conversation of their assignment, they revert back, so the demon lord says "What the Baator, why not" and employs them anyway.