Nu and Avalon are created- The First Age Begins

Life, Birth

Before the world, before the planes, before the gods, there was Nu. The child god who would go on to create the first gods and establish the first seeds of reality as we know it.
  It is impossible to record how a child god born unaware and confused comes into existence, perhaps both the god and the plane were created in tandem through pure cosmic will, perhaps they always existed and simply became aware on this day, or perhaps some larger distant force willed them into being.
  Regardless of the answer, this day is the only day that could be considered the first day in Petrias history.