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Berserk and Subjugation are the only serious arguments a necromancer has in a battle against an orc (other spells are basically unnecessary). Magic Dampening will certainly help the orc, but it's not critical. Trying to reduce their rage is pointless. Cyclops might manage to attack twice, and centaurs, led by Haghesh, and all three of them will attack before the necromancer's first turn (those who don't believe can check my replay in the corresponding thread). And since at level 25, which we're talking about, the centaurs will have a +19 attack bonus and a +13 defense bonus, the battle might end right there. Therefore, to prevent this, the necromancer's build should be as follows: Skilled Dark Magic + Keen Mind (correspondingly, Education and Logistics). Don't rely on the strength of YOUR army, so there's no need to take Attack, Defense, Luck, etc. The orc will kill itself if it doesn't manage to kill you first. Therefore, it's also advisable to take Sorcery.
I want to say that I have considerable experience in this kind of confrontation (I consider it the most interesting), and I play as both the necromancer and the orc, so I can talk about the statistics: If you do everything right, the necromancer's chances of winning are about 80%. However, if you try to bombard the orc with bones or, upon gaining your turn, start summoning phoenixes or casting mass curse spells, then... the chances DROP SHARPLY.