DISCLAIMER: If you have not seen Marvel's Dr. Strange yet and would like to avoid spoilers, I suggest you stop reading now!Anything's possible. It would require a hell of a power source, and I'd personally tie it to Ley Lines, so that you can't literally pop up anywhere, but you can pop up anywhere that there is a resonant Ley Line confluence, which could get you to the right ballpark for most purposes, similar to a competent Way's traveler.
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Say I have a character in Dresdens Files RPG who would like to construct such a "device". Would you consider that possible and, if so, how would you model it?
This just sounds like a plot device. I wouldn't treat it as anything else. Stick an aspect on the building where it exists.To be fair, the one Vadderung made was on-the-fly. It proves it's possible, but it should be significantly easier to enchant a magic doorway with months or years or generations of work put into them.
From a Dresden canon perspective, the only Earth->Earth gate we've seen was one created by none other than Odin, and it was considered to be a masterful use of Way magic. I'd say you're looking at someone around that ability or Merlin as the only ones able to create something like the teleport closet from Dr. Strange.
To be fair, the one Vadderung made was on-the-fly. It proves it's possible, but it should be significantly easier to enchant a magic doorway with months or years or generations of work put into them.Yeah, having a ley line superhighway would probably be a good bet. I would probably also consider requiring the doors to be "tuned" for each destination along the lines of having a thaumaturgic-style connection. That way in the narrative, you can put the heavy magical lifting of opening a few NN gates and zipping between them aside as being powered by the ley line. Aiming your NN catapult would get handled each time by the "tuning" and would be reasonable for a party to do during a campaign without much issue.
That being said I agree that it might be easier to just treat it as an aspect on the location and not get too intricate with it's function. Saying it works via Ley Lines keeps it from being a star trek teleporter, so the DM still has ways to steer the story without the "why dont we teleport in/out" question always throwing a wrench every story.
Because there are lots of flying characters in the Battle of Manhattan, the GM likely laid out “air” zones. Only those who can fly, or jump really high, have narrative permissions to enter those zones (and Stark can because of the previously mentioned permissions granted by his Mark VII Iron Man Armor). However, since the characters on the ground interact pretty regularly with those who fly, it’s also possible that the GM didn’t make such zones, and thus anyone can move anywhere (flight in this instance becomes a descriptor of how they get around, but doesn’t change any narrative permissions).