By the way, weakening is very effective against demons (since the minimum and maximum damage values differ by a factor of 2 or more for all creatures), and if you add vulnerability (of course, applied to the entire army), the demon army will deal very low damage.
I wouldn't rely too much on Berserk or, even more so, Dominate, as with a meager spell power, a Knight won't be able to cast powerful spells; after all, people generally prefer mass spells over high-level single-target spells.
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