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Who knows, I played on the Spleen 1.2 map, and there too, everything was geared towards anti-stealth, with monsters practically covering artifacts with their bodies, but even then, my rogue wasn't useless and leveled up nicely. I think that if you hide a rogue with a Grandmaster-level Stealth skill near the walls of an enemy castle, you can find a convenient moment to capture the castle, or at least constantly be aware of the enemy's movements. In general, a rogue is an incredibly useful hero. And no one has ever died from +50 to army movement speed, in the end, you can put this rogue in the main army, and when something tasty is nearby, send him on reconnaissance. Besides, why would you regret spending 1500 coins on another rogue? I'm convinced that this money will pay off very quickly.