The Vessel of Azorgaron

The amulet you hold contains the power siphoned from the stolen magical artifcats. The cultists intended to use this power to feed the Vessel of Azorgaron, a mortal chosen to hold the power of an ancient and terrible Dragon. Indeed, these misguided humans wish to resurrect the great Dragon, and once their vessel accumulates enough power, there will be nothing to stop them. But if we taint this amulet, and the vessel feeds upon its energies, the vessel would be weakened and easy to destroy. I will work my twisted magic upon your charm, if you will aid me in dealing with a small matter. There is a noble in the Court of Slaanesh who thinks to usurp my lord's power. Her name is Zeola Bayshadows; take this orb and pay her a visit. Return to me when she is dead, and the tainted amulet will be waiting for you.

Cross the Inevitable City and venture into the Slaanesh quarter. Seek out Zeola and while standing near to her, use Pherix's Orb in your inventory to activate it. Kill Zeola Bayshadows and return to Pherix in the Magus Tower to report on your success.