To Ataman: Using zombies and ghosts as expendable units is rational, but the problem is that the enemy isn't always willing to attack and expose themselves to the zombies' attacks. If the enemy has an advantage in ranged units, you'll have to attack... and if the enemy, with the first turn, immediately casts an expert-level slow spell that you can't adequately neutralize with your magic, then with roughly equal troop strength, SERIOUS problems will arise. Even super dark knights, vampires, and liches won't save you. Also, teleportation was mentioned earlier - let's be realistic - what is the probability that a Necropolis hero will have an expert-level water mage, and that this spell will be available? The probability is very low.