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Mages need to acquire two full skill branches (mentorship, magic attraction, witch's reward, secret knowledge, counterspell, secret advantage), which is practically impossible if the hero doesn't have a mentor near the city and lacks hundreds of thousands of gold.
Orcs are terribly imbalanced; I wanted to give them 5 full skills, but I stopped at three, with or without a centerpiece skill; they still always defeat everyone.
Necromancers only need three skills: seal, master, and replenishment.
It's also very difficult for dwarves to acquire the summon skill; usually, absolute defense is obtained at level 25 if there is no mentor.
Knights have a terrible ability, but that's how it is for them.