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Yesterday, I discovered a great trick. I capture my Castle, build a hero, and then use him to take the first Elven town near the beginning of the mission. Two Elven heroes appear. In one turn, they don't catch up to me, but they also prevent me from taking the Castle. After about 10 turns of these short chases, my Castle is well-developed – I ignore the Elves, hire troops, and defeat them. With Agrael, I cleared out the entire Dungeon and even took care of the remaining Elven forces on the surface. Then, I entered the Castle, hired a decent team, and got to work. You can hire far more than a hundred Elven archers. If you capture all the tree dwellings and then run around to level up Agrael, the growth rate increases... This was difficult in version 1.0.