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I'm a big fan of magic items. Everyone who knows my posting history knows that I've a great love for the magic item creation rules, a great love for examining how magic and magic items can affect the world in various great ways.
Magic can create energy from nothing. Making a generator that generates infinite power in Pathfinder is not difficult. It doesn't require high level magic. It's actually pretty rudimentary. By 5th level, magicians of various sorts (arcane / divine / psionic) can begin shaping the world in new and wondrous ways. I actually enjoy these ideas, as they let us break away from worlds entirely of medieval-esque norms and expand our horizons to fill the world with everything from tribal bands of barbarians (not the class) and shamans to powerful empires built on magic and technology.
However, there's a few magic items that are a bit...worrisome. Magic items that by their very existence can throw things very far out of whack, and may even by their very purpose inadvertently destroy the world.
Many of us know of the decanter of endless water that, unlike create water makes no mention of the water leaving existence after it has poured in. If taken purely for its mechanics, one of these could be tossed into the ocean on geyser mode and destroy the world (it might take some time).
I personally have this standing house rule that if a magic item would destroy the world through creating something the created materials vanish after a period of time. In fact, any magic item I make always has a duration on "produce" generated from it.
Today a friend of mine showed me an interesting and cool item that can "break" a world very easily. The Robe of Infinite Twine.
We determined that if you have something to draw off the rope (such as an undead creature, a machine, a construct, or some other automated process) you can produce almost 2500 gp worth of hemp rope every 24 hours, or around half that if you're pawning it at 1/2 price. Given that the robe itself is only 1,000 gp, it pays for itself in the first day. Any world with such an item needs no actual hemp to create hemp ropes, instead you would soon have factories where people simply pull 10 ft. of rope every 6 seconds, or 100 ft. per minute. That's some serious productivity!
Off the top of my head, spells like wall of stone/iron have similar possibilities (these are absolutely awesome for building forts and such on the fly and on the cheap).
What other fun world-altering things can everyone add to this thread? :D