I replayed the new version and completed it in 141 days (I received an archdemon). I didn't understand the point of the dungeon: you have to work hard to get there, but it's empty. I wonder, "what's the point?", or is it some kind of joke. And I also noticed a bug: if one of the heroes is outside the castle when transitioning to the dungeon, they remain there and can easily recapture castles and mines and transfer troops to the main character. Finally, I don't know about others, but in the tavern of the last castle (in the dungeon), "miracles" were happening. In particular, it was possible to hire the same hero who was in the castle, with exactly the same stats. Of course, I didn't take advantage of this, but it would still be good to fix it. Otherwise, the map is very good, and I especially liked the idea with the kamikaze and mines.
If the dungeon is empty, it means the additional quest has failed (the elven cities have been captured).
Which heroes remained?
I'm seeing this with heroes in the tavern for the first time... I don't even know how to fix it.