[Suzerain of Sheol]

That's a good point, and Espy is one track with the decapitation. They still rely on their nervous system for muscular movement, so breaking necks/spines or just cutting off their heads will pretty much mission kill them.

I do feel like I should note, also, that theurgy will directly attack the spirits of he Dybbuk as well as/in addition to the bodies they're animating. Even the laser you were using (and Jeanne's to a lesser extent) which I think we both might have forgot about. Not that it impacted our mowing-down of that horde. :p