Hmm, this sounds a lot like people coming from one of the litRPG universes, those are really funky “paired” universes, although “pair” is not really accurate, more like tuples, or ntuple multidimensional arrays of localverses that are tied together in such away that people can easily inhabit multiple bodies–see my comments in that other thread that’s active at the moment about priests and shamans trying to resurrect people who have already reincarnated.
In these linked worlds, it’s much easier to have multiple bodies due to the intertwining of the localverses.
However, hhhmmm, I should talk to a wizard about this, or really Phaestus or Volund a good manageneer, because I supposed with any sufficiently complex twisting of perceived localverse topologies you might be able to “fake this” and more easily map souls to multiple bodies…hmm…that would be a big break through.
So, to be honest, I’ve never seen this happening in Astlan, so not sure what I’d see. If I knew where they were, I’d go check out their auras.
BTW I’ve spent some time tormenting people in both Neverwinter on Faerûn as well as the city of Greyhawk. Nice people, and if you shake them hard enough these little “animus” coins called “XP” fall out of them, and they are quite tasty, sort of like those chocolate coins but with a bit more of a “rush”