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If I'm not mistaken, the action takes place in a dungeon. The task is to capture the Necropolis castle, right? The passage there, as far as I remember, is blocked. But the map allows you to simply approach these stones and, by pressing the "spacebar," teleport behind them, i.e., enter the opponent's territory. However, the problem is that you can no longer help with anyone. So, it's probably worth considering this :)