I just thought of this. Necromancy in real life is not about raising the dead, it's about speaking to them and asking for guidance, using bones to tell the future, amongst other things.

Pretty neutral, if creepy to outsiders.

But like all things, it can be corrupted. As we've seen in game. So, I was thinking that the storyline for the necromancer would be along the lines of learning the boundaries of life and death and stopping those who abuse its power. You'd still have a darkness theme, and I'd imagine the teacher wouldn't be all that different from the padjil, being pragmatic about who lives and dies, though probably more blunt.