The 2000 Year Epic Campaign
Although no one in the world knows that there was a time before Ao, there was only the Empty Void. An time frame that preceded organized religion and before divine spells, including shamanistic divine magics.
Since they discovery of Ao, the concept of the Empty Void is not known. To everyone, Ao has always been.
Session #16 (3rd Era) – Triton 714, in a flashback to a time long ago, recalled a story told by Endrick Brightblade about the formation of the religion behind Ao and how it was started by a little girl in Pella’s Wish.