The name Azeroth is eerily similar to Lovecraft’s Azathoth, an eldritch horror who lives inside the earth and dreams all of reality into existence.
Knowing Presence whispers: Her dreams sing beneath the surface. Our dreams. Our song. (N’Zoth)
Her dreams sing beneath the surface (Azeroth dreaming under ground) Our dreams…our song…(Our as in Old God/Void, meaning they are the same).
This world is a prison , and I will set us all free - Sylvanas
What if the prison she was referring to was Azeroth’s prison? And we’re all just living on it.
Azeroth also bleeds Azurite, just as Yogg-saron bleeds Saronite. The horde and alliance mined both of them and made weapons and armor out of them.
Old gods are beings who can also use a secondary element, like the Winter Queen being Death and Life. Yogg-Saron is of the Void and uses Death magic (One of his titles is The God of Death). Azeroth is of the Void and also uses Arcane magic (If her dreams create reality like Lovecraft’s Azetoth, Arcane magic is creation magic). This would explain the well of eternity and Azerite being arcane in nature.
All historical records documenting the advancements of the Black Empire purged - Odyn
If the Old Gods were sent to the planet to corrupt Azeroth and destroy the universe by creating a void titan, they had plenty of time to do so during the Black Empire days before the titans arrived. Why would they focus on advancements if their only goal was to corrupt a sleeping titan? Maybe because Azeroth is one of them.
Thanks for reading, this theory is just for fun so please take everything with a grain of salt and have fun talking about it! <3