It is said that their dark visions are granted to them directly by the Old Gods. Whether or not that is true, they provide tremendous spiritual guidance to the cult. Attacking the Sanctum of the Prophets will deal a devastating blow to the enemy's morale and if we're lucky you might run into one of the Firelord's own emissaries while you're there.
Rewards
You will receive: 7 80
Progress
Keep it up, <name>
Completion
You continue to prove your prowess, <name>. At this rate Hyjal might survive this ordeal after all.
Notes
Pick up The Gatekeeper before heading out. Fly west back toward Sulfuron Spire, but take a right heading north at the fork to get to the sanctum. The twilights are all humanoids... the emissaries are flamewakers. As is Azralon, who is in the center of camp.