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Well, if you take the thief from Heroes of Chaos, he immediately has both scouting and stealth skills, so you won't have to sort through and choose unnecessary skills for a specific purpose.
But the thief is also useful because of his speed; you can level up not so much stealth as pathfinding, if I'm not mistaken, which will then increase the speed of the entire army.
But the thief is also useful because of his speed; you can level up not so much stealth as pathfinding, if I'm not mistaken, which will then increase the speed of the entire army.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!