Speak to A'dal, the leader of the Sha'tar, in the center of the Terrace of Light.
Welcome to Shattrath City, [class]. This might be the one place in all of Outland where you'll find any semblance of safety.
A group of naaru known as the Sha'tar drove the demons away from here.
If you've never met a naaru, you ought to see A'dal inside the Terrace of Light. The leader of the Sha'tar is an awe-inspiring sight if I ever saw one. Sure is a change of pace from anything else in this bleak land.