Пандора
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and here's the skill... I forgot the exact name, it's the 4th in their magic, an additional one. At the first two levels in the army, leprechauns, fairies, and wolves appear, then at levels 3-4, elves, tigers, and satyrs, and at the last level, elementals. That's why they're useful! In the army, it's better to give the free space to a second hero or a swarm from the portal (a powerful ranged attacker that grows quickly). If the army were replenished with unicorns and griffons, it would be a different story, and the forest dwellers would become stronger. As it is, they're not very good...
Summoning! And if you don't learn to use it correctly (and every skill in general), to its full potential, it will be a weakness. This is not a useless thing at all, but a very useful one!
Although summoning isn't that bad. I like to put water elementals instead of fairies; they have spells for all occasions... I want to suggest a discussion: which hero should be chosen to accompany the druid – another druid or a general...?
It's strange why a general... I usually choose either a lord or a melee fighter. Nobility is purely for boosting. If I don't need it, then a melee fighter (and later, if possible, I level up their scouting). And for the main druid, I max out Order (the spellcaster is my favorite)