Quote Originally Posted by Harbour View Post
Lets be honest there is The Void and The Burning Crusade.
Everyone who fight The Burning Crusade are unwilling allies of The Void.
And Illidan was the Burning Crusade's Biggest Hater who played the ultimate part in TBC destruction.

Go figure.
I don't think he was initially aligned with The Void, but I think that's how Blizzard wanted to take his character after bringing him back in Legion. All the past lore was structured well for that to be an outcome.