Heleg
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There are other cities on the map that are not as well-defended. I gradually captured them, though I don't remember where. Light elementals joined me. With their help and the dark elementals, I cleared the entire land. Then I built a ship and defeated another group of dark elementals on the island. After that, I entered the dungeon, completed it, and found the entrance to the library. I didn't manage to defeat the library's defenders on the first try, but by that time, the task of not rebuilding enemy forts had been completed, so I calmly rebuilt all the enemy castles and forts, gathered troops, and defeated the library's defenders. The main thing is that in the most difficult battles, I used the Arachne's Blade, which was fully upgraded.