Just finished this mission. At the end, it felt like something was missing, like the traditional cutscene. The red player was getting on my nerves, constantly trying to take my forts. He has a lot of castles, and it was very difficult to deal with him at the beginning. I didn't even bother with Svetlana; she helped by taking one of the red player's castles, and that was it. I initially wanted to complete the quest involving the villages, but I had to restart because something didn't work out. So, I restarted and immediately cleared the Dungeon from the orange player, freed Gwendolyn, and managed to get 3 castles and 2 forts in the Dungeon, which significantly increased my troops, and the red player couldn't bother me there. Then, I slowly cleared the villages, but I constantly used portals because the red heroes kept coming from everywhere. After that, I sent my assistant to place Vestals in the 4 villages, and I rushed with Antoha to the Demon Boss, picking up 2 more forts along the way. The demon is tough, but I defeated him without any problems.
The abundance of castles is amazing – there are only 11 of them on the map.