NerVNotDeaD
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It's difficult against a well-developed Dungeon faction, even experienced players sometimes get ambushed by a fast-moving hero, but... Sharp Mind and Unholy Persuasion are good for Necromancers, Demons, Wizards, and Humans; Empathy and Ballistic Protection are good for Orcs; a Demon with Ballistic Protection is also good, but Empathy is exotic for him; for Elves, Winged Angel on an Anti-Magic hero is a good tactic - Tactics, Aura of Swiftness, Blue Boots, and Native Land. It's difficult for Gnomes against a Dungeon hero.
Added 5 minutes later
Humans - OK, Archers can cover Invisible units with area-of-effect attacks, Demons can drain almost all mana with Imps, the Dungeon faction will have to attack with normal attacks, but what should the others do?