Sounds like There was nothing before the First Ones. Or that this is the first "world". I think the Shadowlands predates the world of the living. There was Eternity's End. (they refered to Eternity's end as the Beginning of Everything) Then they started making other worlds: the other "afterlives" that weren't afterlives yet, then either the First Ones or the Titans made a layer on top of that: The world of the living. Then the Titans made another layer on top of that: The Emerald Dream