Is there any mechanism for restoring pillaged industry buildings – workshop, wheat field, gem mine, etc – once they get destroyed? If you play a game long enough, useful economic buildings are going to get sacked through no fault of your own. To the extent they make essentials cheaper – as workshops do for tools and gatherer huts do for medicine – it can be a pain for them to be destroyed, especially if they were the only one on the map.
While missions to restore buildings or simply paying gold to restore buildings may not fit with where you want to take the game, an automatic mechanism that goes on behind the scenes would work just as well.
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