JohnSnow
Hero
Butcher's Dresden notes that "Cold Iron" is like someone saying you filled someone full of "hot lead." It's not some weird kind of material, the phrase itself is just poetic license. Fey Courts in that world don't deal well with anything that has iron in it of any kind, so no steel for the fey, although it doesn't bother Wizards much. Wizards, on the other hand, don't play well with technology (electronics and the like), something that bothers the Fey not in the least.Tim Powers On Stranger Tides utilises the concept of cold iron dampening magic, so itvwas the widespread adoption of Steel that lead to loss of magic in the old world (Europe). Magic users in that setting mush be careful to avoid iron - including iron pots and pans
Guns are interesting in as much as when fired they become hot iron then deliver cold shot to the target
On the other hand, I learned something interesting while digging into it. Historically, "cold iron" was iron you dug out of the ground, and things that were made from it, like steel. By contrast, there was also "hot iron," which was something you might not expect: star-metal, or "meteoric iron." I guess the assumption was that the otherworldly metal just wasn't as good against faeries, but I found the distinction fascinating.
I also had a fascinating conversation with a swordsmith friend of mine about "bog iron," which is naturally occurring as a deposit in peat bogs, can be mined from them, and grows back. It deposits slowly in the bogs as water runs through subterranean iron deposits. This got me to thinking of all kinds of cool world-building where elves don't cut holes in the ground, but rather simply harvest all their iron from bogs, because they're totally okay with the wait for the deposits to grow back. Similarly, elves don't mine for gold, they just pan for it like during the California gold rush. And so on.
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