This has been bugging me for a while.
For example, Mistborn are powered by eating solid investiture (metals), but if they travelled to Sel, could they be fuelled by Sel metals? There, Elantrians access to the Dor decreases with distance from Elantris, so if they showed up on Scadrial, surely they would have to rely on scaring people with their ghostly appearance due to no access to the Dor? Also, would Rosharians need to heave massive stormlight crystals through space? Can the investiture parasites actually make mega mistborns anywhere but that world?
Cheers!