The Obsidian Isles
The Fall is the name of a cataclysmic event that occurred nearly a millennia ago that caused a mass extinction of the race entitled the Vanguard. Little is known about this event except that the Vanguard seemed to just have disappeared without a trace, leaving their works to be looted, scattered, and lost to time.
Civilizations that came after this event began referring to it as simply, the Fall, and even used the event to keep track of time. There is nearly 100 year gap where almost no recorded history can be found, as the earliest non-Afaerien text in existence dates back to 96 A.F.