Place the Signaling Gem near the Altar of Aggonar at the Pools of Aggonar and defeat any Draenei Anchorites that respond to your summons. Return to Ryathen the Somber at Falcon Watch with the Signaling Gem after completing this task.
Our scouts captured a draenei paladin at the Pools of Aggonar. He was to take part in a cleansing ritual to purify the pools. We must stop the draenei from succeeding or we will lose our supply of felblood!
He was carrying this signaling gem, looking to mark a spot where a priest - or "anchorite" as they call themselves - could perform their rituals in safety. Place the gem near the Altar of Aggonar and be ready to ambush any approaching draenei.
I suggest that you take a friend or two along.
You've returned, <name>. Did you put an end to the draenei's folly?
That'll show those holy fanatics to mind their own business.