A Watchful Eye
The great war which felled the Primordials, begun the First Age, and placed the Gods as the rulers of Heaven. It was led by the Gods who hated their masters, but were forbidden from raising their hands to them. Therefore, aided by the renegade Autochthon they placed shards of their Essence into mortals and created the Exalted to fight on their behalf.
The war ended with the vast majority of the Primordials either dead or subjugated. Only four escape unharmed: Gaia, Autochthon, and two others. Of the two remaining, one was eliminated during the Aftershock War.