Was that the voice of Elune?
In light of the new zones, I re-watched the warbrigner Azshara - nice to see a pristine looking zin'Azshari, but noticed that when Azshara shields up, a serene voice speaks to her, to let go, as she struggles under the strain. All the vainglorious out of her voice, she iterates about the empire she built, and the voice responds, it is over.
Do you think that was Elune? speaking ot the night elf Empress?