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Near the war school in the forest, there is a well, from which a hidden passage leads to a guard post containing fairies and an ambush.
Use the pathfinding mode in the editor; it's very helpful in such maps: everything hidden becomes visible.
Well, the map is just a lot of running around. The only worthwhile moments in the entire map are the battle with 1 harpy with hypnosis and lightning (quite original, but the presentation is banal) and against 7k phoenixes.