S-t-i-n-g
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ZYbr, you are absolutely right; in the fourth installment, the developers decided to create true HEROES, and in my opinion, they did a very good job. The only downside is the slight imbalance between the factions. As for the topic at hand, the most optimal hero is a Rogue with maxed-out Stealth, Melee Combat, and Chaos Magic – an ideal unit for sudden, devastating attacks. He moves quickly and is invisible, can defend himself in battle, and can easily escape if necessary because he usually moves without an army, as it hinders his Stealth, and at a high hero level, it's not even needed. IMHO.