Hmm, I wasn't thinking about mind hunt. That could work. I don't have it yet but I could get it pretty quickly. Disintegrate was basically what I was thinking, I was just having trouble figuring out how to deliver it
Well, that and banefire.
Hmm, I'm aware of astral fatiguing spells but I can't think of any others offhand except for sulphur haze. Probably wouldn't take too many casters to overcome its resilience amulet.