Era beginning/end
The God's swear and oath and build upon the ruins of the old world to craft a new world.
With the destruction of their proving grounds the Gods fear they will become like Primus and Prima. They come together to build a second world on the ruins of the first. This time they swear to no longer directly affect the new world. The Gods create new creatures but their first creations appear in the new world. They name themselves Archfey and claim the world for their own. With the Gods oath they cannot stop the Archfey but even without their oath their creations are powerful.