What skills should Necromancers take when facing Orcs on a very large map?

You need to upgrade "Scream of Horror," and if you also collect a Necropolis artifact, things will get really interesting. I played against Orcs myself, and they had -10 morale and -4 luck (it's fun to play when your opponent doesn't take turns), and my army became five times larger in just two months!
P.S.: Put a Berserk on their Cyclops; it'll be a tough fight!