Tactics for playing against a Necromancer.

In my opinion, Orcs with Anti-Magic against Necropolis look good. Especially against Zoltan.

Why "especially against Zoltan"? Is it because of his ability to block spells? After all, Barbarians don't even know how to cast spells. What does Anti-Magic have to do with it then? It's understandable that they're effective against Necropolis. In my opinion, Dark Magic against Ravenna is the most effective.