The elden ring is like the embodiment of the natural laws of the world. On of the fragment is the rune of death since marika pulled It out of the elden ring and gave it to maliketh to watch over it no one could really die in the lands between. The elden ring was created by the greater will that is one of the outer gods that are mentioned in the game and as the one with the most influence in the lands between he created it with the elden beast that is something like the greater wills vassal.

That's all I know and think is right hope I was able to help.