I can't remember if Emet ever mention this or if it's accurate at all but in the cutscene where Emet is explaining calamities and the reflections are their "locations" I guess you'd call them, accurate? Are the 11th and 12th closer in a sense that maybe travel between them would be easier? if so I do wonder

Since the 12ths calamity was lighting aspected maybe Sphenes world is the 11th reflection and there was some spillover to the 11th and it's what caused the world to be more heavily aspected towards lightning?