I've played the mod Art of the Thanaturge and I've wondered about a few things.

Like were is the Raven form I thik it would be an Invocation. Love your family idea. Also how can you make an incorporeal thrall or other types of undead other than skeletons?

Did you turn the curse feature into invocations.
Note: I love cursing people
Mwah Hah Ha Ha........
Dam backlash now I'm blind.

Still I think you should add Curses for evil Thanaturges somewhat like evil clerics get different things to good ones. I have no idea what what good ones would get?