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I completed this mission today on veteran difficulty, and I didn't notice any difference compared to playing on a lower difficulty. Isabel was sitting in the castle with a large guard. By the time I attacked her, which was on day 6, week 4, month 3, my army consisted of over 100 archangels, 150 paladins, 1.5k archers, over 200 monks, and so on. Isabel, on the other hand, had 14 archangels, 25 paladins, and a few other units.
Well, at least I got to fight her a bit, unlike with Markel and Nicholas)).
PS I'm really tired of having to run around with all the heroes to level them up. By the way, I attacked Isabel with Zephyr because he had the lowest defense and attack stats. I wanted to level him up, but since Isabel had so few troops, I didn't gain much experience.
Well, at least I got to fight her a bit, unlike with Markel and Nicholas)).
PS I'm really tired of having to run around with all the heroes to level them up. By the way, I attacked Isabel with Zephyr because he had the lowest defense and attack stats. I wanted to level him up, but since Isabel had so few troops, I didn't gain much experience.