The player Desertdweller should only be allowed to walk around desert biomes ingame after dev period. If he tries to exit it, it pushes him back with a text that says "You don't dwell there!"
Stop all development immediately, this is a priority number 1 feature.
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A wise man once said: "War is never a lasting solution to any problem."
That man never played a super hardcore survival server on a lego building game.