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Dark Lord, in my game in version 1.5, the enemies were level 22. I was shocked when I was defeated on the 2nd day during my first playthrough. My mana (260) ran out.
Kitsune, after Gilraen, there's a mission where you first need to capture 3 elven castles and 1 of your own underground. There, Agrael's elven soldiers desert at night. Then you need to feed archers to the dragons or defeat them and capture the last castle.
In version 1.5, the garrison of this castle grows well. I had 40 emerald dragons against my 15 archdevils. And the enemy had an even greater advantage in low-level units. My Agrael, equipped with artifacts and at level 30, managed to handle it. This was on a hero. But two of my friends had serious problems with this castle, even on recruit difficulty.