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I think we had different difficulty levels. Because I lacked experience, I played on the easiest setting, and that was enough to complete all of Markel's missions. As for Isabel and Godric, they were poorly leveled up because I started playing Heroes 5 directly with the campaign, and I didn't even know about the forum or the supplementary materials. Also, the first campaign was mostly spent getting used to the game – before that, I had only played Heroes 4.