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Makc512, nothing compares to the Necromancer when it comes to chaos. Perhaps only a Druid with an enchanted ballista can compete. But even then, only as long as all sworn enemies are still alive. However, the Necromancer is also far from last in this regard.
I'm afraid that by the time you start casting mass spells of light and darkness, there will be nothing left of your army. But in general, it will be interesting to see what you come up with. After the first mass spell of light, the opponent should realize that you have Divine Retribution. He will probably use Horde Fury to attack your skeletons at the beginning of the battle.
I hope you and your opponent have roughly the same level of skill.
After the battle, click the "Save" button - this will create a replay of the battle. I don't have the game on hand right now, so I can't say for sure which folder it will be in.
You are wrong about the defense. It doesn't increase the defense parameter, but reduces losses in melee combat by 30%.
Added after 1 hour 48 minutes
Another addition: With a large number of castles of all races in a long game, the Necromancer should be able to defeat anyone, regardless of their build.