Archmage Lan'dalock in Dalaran wants you to return with the Curse of Flesh Disc. This quest may only be completed on Heroic difficulty.
Little is understood about the condition known as the Curse of Flesh. However, there is information to be had within the Halls of Stone.
Sjonnir The Ironshaper seems to know a great deal with regard to the curse. We have it on good authority that he is carrying a Titan disc of information upon him that could answer all of our questions.
Retrieve this disc for me, [player], so that we may learn.