DragonOfTheAerie
Vala
I have a world where portals for transportation is common. Trade would be far easier and you'd have less spoilage if you could travel an hour to the portal, pass through and then another hour's travel to your destination.
The side effect is that moving military forces into a country's territory would be super easy. There was an accord after a war that employed portals. Only a few portals exist that will take people to other countries.
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You'd have to put constraints on the availability of such magic. Stuff that powerful is likely to have a ton of implications you don't realize.
I'm thinking about uses for smaller portals. You could have portals in toilets to teleport waste someplace far away. Portals in your office with addresses above them through which you can send letters and messages. A small portal in your door to serve as a dragon door for your shoulder-sized dragon.