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IMHO, the coolest thing about the Dungeon campaign is Railagh.
With his ability to reduce initiative, spells like those of a wizard company (without artifacts, around 35), and skills that grant +50% magic damage... when Meteor Shower deals 2500 damage, an army is only needed so that the hero has time to cast a couple of spells. In any case, Railagh was the one who fought for me most of the time. Even in the later missions, when the armies were large, the hero killed most of the enemies.