So in this demo from Anet, Eric talks about the Temple of the Ages and how it now has become underwater, he points out that it became forsaken by the gods in the 250 years and the black curtian is no longer called that but the Godsloss swamp...
So Lets talk about the Godsloss swamp and why the Gods forsaken it.
Godsloss Swamp: 6:00
I was thinking maybe Zhaitan has something to do with that, but i'm not really sure.
Maybe is has to do with the big monster that you fight in that area,the big boss called The Shadow Behemoth.