I don't understand where you got so many legions of archers and other units with a small number of dragons and no creatures of other levels?
Also, could you provide the coordinates of the location from which you saw the other part of the Dungeon?
The Dungeon is visible from the Dungeon near the castle. A narrow strip with resources lying in a row is visible.
Added 12 minutes later
I don't understand what the point of this is, and why turn "Heroes" into another game with some kind of secrets and a lack of strategy as such. Aren't there enough other games? And the presented map, although it seems to be made with love, looks like... a mess with an unknown ending. In general, my condolences to the author, and hello to everyone.