Would not mind having the wall belong to one of the factions (like in the limes case or for Hadrian's wall - or the great chinese wall). In return to this "unfair" advantage we might want to deplete resources a bit on their side, e.g. less stone or metal.  Alternatively, a more complex scenario could be envisaged where the faction owning the wall would be threatended by Gaia on their own side, e.g. a village that was originally a peaceful ally would turn into hostilities after a certain tim
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