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He debuffs and removes buffs, but most importantly, he builds an army for battle.
What will a strong thief do? I haven't played much with other players, only about 5-8 times with my brother, and even then, we just saw each other's moves. It's like he's supposed to capture my mines, right? But at level 5-8, his stealth skill won't be very high.
He won't be level 5-8. The thing is, the map is such that the thief has room to maneuver (monsters aren't densely packed around the treasures), and the thief will receive stealth bonuses. When passing through 3-4 levels of monsters, this experience bonus is quite noticeable, and therefore the thief can very quickly gain levels and upgrade not only the scouting branch but also the combat branch.

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!