The creation went down in the beginning of the First Era or previously in the Era Zero (authors didn't name it) but actually it wasn't really a creation rather a re-formation. The Satralis has already existed - it's the fourth planet in her system - when the Great Ones arrived. Sometimes they are called the Nine. They fought a war in some other universe and they sought refuge on the planet. They just loved the place and they begin to shape it. They built nine crystal spheres around the planet and started to populate the continent with their creatures.
But then the One, an enemy of theirs arrived from outer space and crushed through the crystal spheres and attacked them. They fought it and managed to torn it apart and dispersed it's pieces over the southern half of the continent. Then they retreated to the upper spheres. It took eons for them to recover and when they returned they were surprised to see that civilization emerged and they all worshiped a god whom they called Guardian/Protector. They recognized this god, it was the One, or at least some parts of it assembled themselves together. I highly suspect this was the god whom later races will know as Ranagol, it is also a possibility that this god was the same whom the elves call Urria, I'll write about this later because the implication of this would fit in a satire.
The Great Ones made planetfall on the northern part of the continent and started to breed new races and created a barrier between the two parts at the equator. This barrier is the mountains of Sheral, certain peaks reach over 20 km heights. Then they fought a great war which destroyed everything. Seeing the devastation and the suffering of the lesser creatures made them think, slow down, then stop. And they said "we might dun goofed". They defeated the Guardian, but it was too late a new god arrived who was also a chunk from the One. Her name is now Orwella, the Kyr called her Avida Dolor. She's the Chaos herself and she brought even more destruction. And that was that.
The Nine decided to retreat again and went into a coma like state in a place of a sphere hidden by the Silver Moon. But before that they told a prophecy about the Nine Eras to come.
One thing to note here: it might be that in this non-era came into existence the Old-Tree - let's call it Auld-Tree from now on as it's the favourite thing of the elves - a world tree which sap was magic. I don't know when it was created and how it hadn't been destroyed in these wars.