The First Rain (FR) is an event that occured in the Four Colour Collective (FCC) Past Universe.
The First Rain is the event that created perhaps all of the Old Races. The Old Gods used their power collectively for the last time to create and shape the world upon which life would dwell. It was a time of unimaginable power and ability as the forces of creation struck out into the eternal darkness and created what we today call reality.
It is from these events that the Old Races drew life and came into existence.