Some Xal'atath quotes:
Xal'atath whispers: The God of the Deep writhes in his prison, breaking free ever so slowly. You should hurry and defeat the fallen titan... there are greater battles yet to fight.
Xal'atath whispers: Do the naaru speak of the eternal conflict? That the entire history of your world is but a fraction of the time that has passed?(near Saa'ra)
Xal'atath whispers: The walls between realms are thin here, so easy to tear open. Do you know what would happen if true shadow and light would meet here?(in Netherlight Temple)
Xal'atath whispers: Another fool who believed Illidan's lies of sacrifice and righteousness. Tormented, he turns on everyone.(at Tirathon Saltheril)
Xal'atath whispers: The fallen Aspect's lair is near. He was the strongest of them, and yet the easiest one for us to corrupt. (in Highmountain)