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I will defend my favorite faction! In my opinion, they are beautiful, especially the demonesses and dungeon lords. I think the imps and devils are less successful... And regarding combat, a well-developed "Gate" skill + the "fast opening" ability gives at least a 50% increase to the army, and that's for free. By the way, if you clone your creature, it can also open gates, and each clone can do the same. And their initiative, if you develop the hero accordingly, is so high that the opponent doesn't even have time to move... In Heroes 3, I loved the elementals, in Heroes 5 - the demons are beautiful:-). And the Inferno castle is just brilliant!
That's right! Inferno has the best units!