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I only managed to complete it on Veteran difficulty after 4 attempts. Agrael didn't have diplomacy, but he did have knowledge of technology, the ability to open portals, a few other skills, and most importantly, the clone spell. Without it, I definitely wouldn't have succeeded on the fourth try. Regarding the Druids... You know, at first, I didn't pay much attention to them, but when the number of sprites that happened to be in the way and blocked the path exceeded 300, I perked up. In principle, it's not a big deal – you take them down with archers, and if anyone gets hit by a spell, you resurrect them with a tent, but that's Agrael; what about other heroes? I had to go to the Druids.