Necropolis – “Dawn from All Sides” [Campaign 2, Mission 3]

I just finished this mission on Hard difficulty, and there were practically no difficulties, except with the demon Deleb. At first, I also went down, captured the castle, and then went to Ludmila, but that's not the point. I wanted to ask about the level, as I started this mission at level 14. Nastya was level 24, and that was only because it was the maximum level, and I also leveled up Lyuda to 24.