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There is no mentor, at least not on the island; the map is almost completely explored, and the surface is certainly fully revealed. I might have added too many neutral creatures to the teleporters; it's almost impossible to kill them in the first month, and even in the second month, it's very difficult, and even if you do manage to kill them, it will result in significant losses. As for the Tear of Ashtar, I think it would be better if the game didn't end when the city is built. My suggestions: slightly weaken the neutral creatures near the teleporters and allow the game to continue after using the Tear of Ashtar.