Elite lieutenants of Dol Guldur have been seen patrolling the hostile region of Southern Mirkwood, including Ghámgur, a brutal warrior with a thirst for death.
'Ghámgur, a powerful Gorthorog out of Dol Guldur stalks the hills and valleys of Mirkwood. His mission is unknown to us but perhaps he merely patrols to intimidate us. If you encounter this powerful foe, defeat him quickly.'
Ghámgur can be found somewhere in Southern Mirkwood.
You should defeat Ghámgur.