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I'm looking at the poll, and it seems that Death and Nature are in 2nd and 3rd place, but Nature is strong with its Druid and summoned creatures. However, the downside is that if the hero is killed, the army can lose. But the worst thing for Nature is Necromancers with their plague. However, Nature has a plus: protection against necromancy. It's better when the hero is a summoner (Life + Nature), as they won't be killed by plague and can resurrect, plus there's a bonus to increasing the number of summoned creatures. But the best faction is Haven; you can build 4 archers, but I don't use mages because they're weak and get killed often; golems are better.