Acquire 4 Healthy Courser Glands and bring them to Ogtinc in Azshara. Ogtinc resides atop the cliffs northeast the Ruins of Eldarath.
The mosshoof coursers of Azshara are magnificent animals who once lived in Felwood. They naturally resist disease and poison, and were unaffected by the corruption there. In their ancestral wisdom, they simply chose to leave that sickened place.
It saddens my heart, but I must ask you to hunt these mighty beasts for me. Gather four courser glands as the first ingredient for a restorative salve -- a salve we will use to heal Felwood.