Reached the underground. It took 10 months because the scouts are incredibly annoying, constantly trapping me in places far from teleports. I have to spend a long time waiting in safe zones and planning escape routes. They also capture mines and dwellings, forcing me to return. I really regret taking Furies instead of Boots at the beginning. Luckily, these two disappear when Ossir appears; otherwise, I think I wouldn't have had a chance. But overall, the game isn't too difficult, especially once you find the witches.
Found a small bug. When the Crystal Dragons demand crystals, it says there aren't enough, even though there were more than 50. I had to get rid of them, with the scout sitting on my shoulder. Also, it would be great if they could fix the Green Dragon's turns, where it constantly messes around with the teleports; it's very annoying.
Only the underground remains. Of course, very tough armies have accumulated there over 10 months, but I also progressed with almost no losses, so I should be able to handle it.