The Tale of Igor's Campaign

You need to destroy 4 castles (the condition for the "Pillage" quest). Are you sure this quest has been completed? Most likely not, as the map was tested by people who know what they're doing ;) If I'm wrong, I'll look into it...

Added 1 minute ago
There's one castle that you need to go through a dungeon to reach.

No, I'm certainly a morally upright person, but not to that extent))) All FOUR castles have been destroyed; if needed, I can provide a screenshot. But the "Pillage" quest is still not completed.

P.S. I can't go through this again; I've already started playing the game from the beginning when the new version of the map was released(((