In those cities where you need to defend, first build all the towers and the unique building that sends a meteor shower on the enemy.

No one attacked me in the city. I also didn't build either the meteor shower building or the building that provides worms for defense. I was more inclined towards the worms, but I don't know - will they be summoned every time the city is defended, or just once?

After that, you can defend with a single stack of succubi placed in a tower. I don't remember the name of the cities, but in the rebuilt human castle, my secondary hero of level 5, without combat skills, defended himself like that (just in case, I also gave him wolves that are found in ruins). After the reconstruction and opening of the gates, the Necromancer arrived on the 2nd day. It was just enough time to build all the necessary buildings.

And how do you place archers in a tower? You live and learn...

Only Nar-Erish remains to be conquered, and there's a tough lady sitting there - there were over a hundred liches. But I've already cleared the path to the dungeon - there were 3 squads of spiders, with 22 units in each squad!

Mother Namtara turned out to be weak - she surrendered her position on the second turn, and didn't even have time to restore her strength with ghosts!