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Is the hero too difficult to control? Turn on auto-battle, and the problems will disappear =). For the first couple of months, I slowly leveled up on neutral creatures, gaining skills like empathy, sharp mind, mind control, and storm wind. At the same time, with Inga's help, I learned various runes. By that point, blue had overtaken green. The first encounter with him, with a high danger level, resulted in him fleeing in auto-battle without any losses on either side. A couple more similar encounters occurred. Then, I walked to his castles, and the map was completed. Perhaps there's a way to script the AI for the hero? Or give him shackles at the beginning of the game. Because when I decided to replay the battles manually, he gave me a good beating before running away.