GongZigoton
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It was enough for about halfway through. Mission: The Great Mage's Crown. The given hero is Iskandirel - an archmage. He's slow and has low combat skills and tactics. In the fortress that needs to be captured, there's a level 3 tactician with phoenixes. And he's wearing the Robe of the Guardian. So, I can only move the hero around a maximum of two times. Among the high-level spells, I only have Nature and Chaos. I can summon about five devils at a time, or use Strangulation, which is basically it.
Strangulation is a bad move, but devils are generally a good solution. In general, Iskandirel's scenarios are tasks that require logical combat and magical power. Try using single vampire units as cover, forming a square formation, summoning devils, using a charm if it appears against nature, or using general zeal/general sorrow, general fortune, drinking from fountains before the battle; overall, this might help.
I'm a furry dragoness, 'cause I can.