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

Ha! I recently played with a friend on a large map, Haven against Necropolis, and the Necropolis didn't stand a chance. Cyclops were crushing them, and Executioners were tearing them apart. Darkness didn't help the Necropolis at all. So, it won't be possible to defeat an Orc without losses; the Orc will crush the Necropolis. Darkness is useless! So, your post about Necropolis is just childish babble. And even with strong magic, Orcs under Fury will crush everyone.