The Spirit of Ar'tor at Illidari Point in Shadowmoon Valley wants you to recover the Second Fragment of the Cipher of Damnation from Veneratus the Many. Creatures attacked or damaged by the Spirit Hunter will not yield loot or experience.
At last, we are ready. I will bestow a piece of my spirit upon you, hero. It will guard you and help you in your battle against evil.
You must then travel south of here towards the back of Illidari Point. Hidden in the ether is a vile creature known as Veneratus the Many. My spirit hunter will call him out when he is near.
Destroy Veneratus and take from his corpse the second part of the Cipher of Damnation.