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I got to the third mission, and it's incredibly interesting! :) The author did a great job! :) Just for fun, I decided to try defending against one of the brown heroes in the dwarf castle. He had 800 berserkers and 1200 warriors, and his hero had stats above twenty plus absolute defense. I hired about 500 spear throwers and 106 Arcane Priests with all the money I had in the castle. In defense, there were also 1200 warriors. I replayed the battle about ten times, but I finally managed to win! The battle was very long and tedious due to constant bad luck. First, I destroyed the catapult, then I used a wall of fire to attack the berserkers, and the computer was so dumb that it didn't even move them out of the fire; it just waited for its turn. I was also very surprised that during this long battle, it never figured out to destroy my ammunition cart. After the battle, I had 411 spear throwers left. Too bad that the additional quest is still considered failed. I thought that if the enemy attacks you and loses, the script wouldn't trigger. Oh well, I reloaded to an earlier save and surrendered the city.
I also noticed a funny thing: as soon as the brown faction appeared, Varrens started running away in auto-battles with neutral creatures, even small ones. It was terrible! I had to replay every battle myself. I upgraded Varrens with skillful logistics and pathfinding, and the Path of War skill, which gives extra movement points for winning battles on the map. But for Andrias, I specifically lowered logistics to average and removed pathfinding; now he shouldn't be able to catch up to me in the third mission.
Here's something else I forgot to ask: in the southwest of the map, before the last castle, there was a neutral mage standing near the garrison. I never understood what his role was. Perhaps only to take the artifacts of Sar-Issa from him