[Opalescence]

Where to find the dude for the dragon's blood: well, unfortunately my memory's pretty rusty on that. I can't remember exactly where but I think it might be somewhere between Tarant and Ashbury. It's called "Forgotten Temple", or something like that (don't quote me on that though! I can't be sure...).

As for the spell "Raise Spirit", no it really doesn't serve too much of a purpose. In my opinion the only spell worth getting in darke necromancy is Harm. Anyway, the only other quest that Raise Spirit really did anything for is the quest involving the murders in Caladon. Instead of asking around what the dude who was killing all the women looked like, you can raise the spirits of the dead women and ask them. It really doesn't matter though, because you wouldn't get any more information.