What if we bring this idea into a fantasy RPG? What resources could you limit or make finite that would directly impact your party of PCs? How would the PCs deal with it? How could the PCs alleviate the problem?
Natural resources could work, but they tend to impact the overall story more than the actual day-to-day play. Sure, prices might go up and a once-mighty mining city may lose half its population, but parties can always fall back on magic and superhuman skills to fill the gap and keep them afloat.
What if we go one step further and strip the PCs of their favorite tools?
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What if we went further?
What if magic had limits?
What if the Aether dried up? What if the infinite planes started running out of creatures to summon? What if the god of magic died and the infinite fountain of arcane power started sputtering as mages tried to cast spells?
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What if we went even further, into the rules and the nature of randomness?
What if the players had a limited pool of die rolls to choose from?
What if they could choose their die rolls, but they needed to use every d20 result once before they could use a number again? Or what if they were cursed by Lady Luck who only let them have a limited number of die rolls in an adventure before every die roll comes up 1? Would they spend their limited die rolls on combat hits or saving throws?
Welcome to the Gedankenexperiment. If you have experience with any of these ideas, or if you introduced limited resources into your game, please let me know how it worked for you in the comments.
Thanks for reading!