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The two most useful creatures in the game are the Chaos Scout and the Chaos Sorcerer. The Thief runs around the map, terrorizes the enemy, and tries to eliminate populations from cities, avoiding clashes with strong heroes. The Sorcerer, on the other hand, hunts down strong heroes in explored territories and defeats them with magic and an army. The Thief runs around without an army. The Sorcerer has expert pathfinding, and the Thief has stealth. If you develop the heroes correctly and wage war strategically, the effect will be amazing.
P.S. Heroes are the most powerful creatures in the fourth game.