The Harbinger is a small quest and one of the first you can complete at the start of the WoW The War Within campaign, but it was also doable in the pre-patch.

Although it’s a small quest on its own, The Harbinger is part of a bigger chain quest that introduces the Xal’atath, the main antagonist of WoW The War Within expansion. By completing this quest, you’ll better understand what to expect in the new expansion and who you’re dealing with.