Ethereal
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For some reason, no one mentioned such an interesting feature of the Swamp faction as its actual immunity to Berserk magic.
Due to the significant advantage of defense over attack, both for the Swamp heroes and all its creatures, casting mass Berserk on them is practically useless. But Barbarians, on the contrary, successfully eliminate themselves under mass Berserk.
Useful. Only in progress. On Hydras... Doesn't matter how many, but sometimes it can deal a lot of damage. And that's a plus, especially if the opponent doesn't have teleportation.