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I think that the most useful unit in the game is the vampire. On the battlefield, it restores its health (it's practically immortal). It moves quite well (quickly and far). And if the hero has necromancer skills, new vampires join the army after each battle. Even though its price is slightly higher!
It's easy to defeat a vampire with magic. And in general, slowing it down is enough to make it completely helpless. By the time it reaches you, it's unlikely to survive. Therefore, I choose the Crusader and the Djinn as useful units against the undead.:D