Someone mentioned in some other thread that we return to a sort of mother crystal a central part of the aetheric rivers that we use to travel from aetheryte to aetheryte and are held there in stasis and then released when the time was deemed necessary fro the adventurers to come back. Speculation most likely, but aetheric rivers are a big part of 14, while the crystal staple is a big one in FF (especially in the likes of 11 biggest example is Promathia expansion). Maybe right who knows?