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

An Orc can be dangerous if it has decent magic resistance. And it's not hard to find a Berserker with a Dwarven shield. On the other hand, with all these drawbacks, it won't be easy to level up its Spell Power skill. That's a plus. Also, you don't need to take the Summoning skill; it's better to focus on Darkness and level up Luck and Soldiers skills so that the vampires can control the Cyclops. There shouldn't be any problems with the rest. Yes, and it's desirable to have a larger army.