Quote Originally Posted by DrWho2010 View Post
Primals are summoned out of the aether. After they are defeated their aether is returned to the land.
I could be getting my wires crossed, but if I recall in ARR the Scions give a PowerPoint presentation explaining that the souls of Primals (which comprise some of their aether) don't return to the land, but exist in another sort of plane between summonings. I can visualize the scene in my mind, but I'm not having any luck figuring out which one it is so I can rewatch it and verify the concepts.

Nitpicks aside, there's definitely no "world of Primals" in FF14. And that will become especially clear with some of the plot points in Heavensward's MSQ as well as the Eden raids.