Azruthor's forces venture out of Tarlang's Crown including Amorchant, whose lifeless corpse is controlled by The Dead.
'The Sorcerers of Umbar have called forth evil spirits to carry out their orders. Fell spirits under the command of Azruthor's forces have possessed the bodies of many slain beasts.
'One such beast was once a Mountain Drake, Amorchant. Now it is a twisted creature, not of the living. I have looked into the eye of this Fell-drake and only saw pain and suffering. Your aid would be appreciated in putting Amorchant to rest and taking it away from Tarlang's numbers.'
Amorchant can be found somewhere in Western Gondor.
You should defeat Amorchant.
Aelnir can be found in the city of Dol Amroth.
You should speak with Aelnir.