This quest is part of a chain that leads to obtaining the Medallion of Karabor. You must have completed the chain ending with  .
Travel to the Warden's Cage in Shadowmoon Valley and speak to Akama.
Thanks again, <name>. I recognize your name. Akama has entrusted you with his plans and so I will trust you as well.
The naga discovered I was working against Illidan and tried to get me to speak by torturing me. I did not tell them a thing - Akama himself taught me to master pain through meditation.
Illidan asked the naga to bring me to him. He would have seen right through my flesh and into my soul's deepest secrets.
Akama must be warned. Our plans are in jeopardy!
I thank you, <name>. Olum is one of my dearest friends and most trusted followers. His contributions have been of vital importance to our plans.