Originally Posted by
Engal
I like to think that blizzard put several idea and adapted them in every game they made at that time ( Starcraft, warcraft, diablo )
The genesis of the Diablo Universe with Anu might be somehow how Elune came to be into the warcraft universe.
It is stated that WoW universe was born with a clash between void and light.
The diablo universe is exactly the same, but they went to explain what was this clash and how it came to be. In chronicles, we still don't have any word on it, and Elune is not explained at all, I believe the answers lies in what was before the universe of WoW, and it'll be something very similar to Anu in the Diablo universe.