Points of Light as a setting idea always crops up from time to time and D&D 4E heavily advertised with it. But what always bugged me with that is how it ignores how much interconnected infrastructure (to avoid the term civilization) is required to achieve something like the default technological level in D&D.
Especially when you get to the extreme end of Points of Light where it is literally just one city surrounded by monsters.
Farmland
Medieval farming is inefficient, especially when you base it on European crops and thus do not have access to rice or potatoes. Most of the food grown is consumed by the farmer and his family with only a fraction reaching the market. So even in a city of 5.000 you would need at least twice that number of farmers in the surrounding lands to support it and all land around the city for several miles would be devoted to farms.
If that land is already dangerous and monster infested the city would starve.
And its not only food that needs to be farmed. Flax is a very important crop as you need it for textiles and also would take up large tracks of farmland
Animals
Animals are also needed to support a D&D level of technology. Not only as beast of burden to even allow all the products to be transported to the city, but also to supplement the food sources and, important for adventurers, as a source of leather and also other products like glue. And those animals also need land to graze on or even crop to be fed in the case of larger warhorses.
Wood
Nearly all energy demands are met by wood and especially for smelting this demand is huge.
For cooking and heating other resources can be used like manure or coal (if your point of light has access to coal) but as coal contains sulphur it is not suitable to make steel which the equipment of adventurers need (unless you coke it, but that is outside the D&D technology level). Even wood needed to be made into charcoal first which required even more wood.
One example of the amount of wood needed I found is that to equip one roman legion you needed 44 metric tons of iron which in turn required 600 tons of iron ore and 5100 tons of wood to make
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So when your forests aren't safe no iron weapons for you.
Metals
The other required resource for iron smelting is of course iron ore. And you also need a lot of it as during smelting there is a big loss of mass. Luckily iron ore is rather widely available. Still, we are talking about a point of light. Some other metals would of course also be nice like brass. Bronze is hard to make as it is an alloy requiring two metals which not tend to appear in the same place.
And if you want to pay with gold and silver coins a source of gold and/or silver would be highly appreciated.
Stone
Want a stone wall? Or paved streets? Then you require a source of stone and a quarry there.
Chemicals
Often overlooked, even in medieval times people know some chemistry. For example tanning leather required several (smelly) chemical processes which caused those workshop to be located away from the city. That ranges from simple "chemicals" like sides to sulphuric acid to some rather exotic components like gallnut (the remains of insect larves incubating inside tree bark) to make ink which is rather important to wizards. Other required resources was gum arabic and and iron vitriol. Paper and parchment on the other hand are made by animal hides or out of flax (which also required chemicals).
And there are probably many other things I forgot like having access to tar when you want to have ships, etc.
The point is, medieval technology, and with it the technology in D&D, is already so complex that a point of light settlement can't support it, even if that point is the size of a kingdom.
Especially when you get to the extreme end of Points of Light where it is literally just one city surrounded by monsters.
Farmland
Medieval farming is inefficient, especially when you base it on European crops and thus do not have access to rice or potatoes. Most of the food grown is consumed by the farmer and his family with only a fraction reaching the market. So even in a city of 5.000 you would need at least twice that number of farmers in the surrounding lands to support it and all land around the city for several miles would be devoted to farms.
If that land is already dangerous and monster infested the city would starve.
And its not only food that needs to be farmed. Flax is a very important crop as you need it for textiles and also would take up large tracks of farmland
Animals
Animals are also needed to support a D&D level of technology. Not only as beast of burden to even allow all the products to be transported to the city, but also to supplement the food sources and, important for adventurers, as a source of leather and also other products like glue. And those animals also need land to graze on or even crop to be fed in the case of larger warhorses.
Wood
Nearly all energy demands are met by wood and especially for smelting this demand is huge.
For cooking and heating other resources can be used like manure or coal (if your point of light has access to coal) but as coal contains sulphur it is not suitable to make steel which the equipment of adventurers need (unless you coke it, but that is outside the D&D technology level). Even wood needed to be made into charcoal first which required even more wood.
One example of the amount of wood needed I found is that to equip one roman legion you needed 44 metric tons of iron which in turn required 600 tons of iron ore and 5100 tons of wood to make

Collections: Iron, How Did They Make It? Part II, Trees for Blooms
This week we continue our four-part (I, II, III, IVa, IVb, addendum) look at pre-modern iron and steel production. Last week we prospected our iron ore and extracted it from the ground and did some…

So when your forests aren't safe no iron weapons for you.
Metals
The other required resource for iron smelting is of course iron ore. And you also need a lot of it as during smelting there is a big loss of mass. Luckily iron ore is rather widely available. Still, we are talking about a point of light. Some other metals would of course also be nice like brass. Bronze is hard to make as it is an alloy requiring two metals which not tend to appear in the same place.
And if you want to pay with gold and silver coins a source of gold and/or silver would be highly appreciated.
Stone
Want a stone wall? Or paved streets? Then you require a source of stone and a quarry there.
Chemicals
Often overlooked, even in medieval times people know some chemistry. For example tanning leather required several (smelly) chemical processes which caused those workshop to be located away from the city. That ranges from simple "chemicals" like sides to sulphuric acid to some rather exotic components like gallnut (the remains of insect larves incubating inside tree bark) to make ink which is rather important to wizards. Other required resources was gum arabic and and iron vitriol. Paper and parchment on the other hand are made by animal hides or out of flax (which also required chemicals).
And there are probably many other things I forgot like having access to tar when you want to have ships, etc.
The point is, medieval technology, and with it the technology in D&D, is already so complex that a point of light settlement can't support it, even if that point is the size of a kingdom.
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