The egg-stealing half-orcs are being overseen by a particularly vicious creature named Arzgât.
Calelloth has asked you to head out to the northern hillside of Carchres and slay Arzgât.
'You have dealt with the half-orc rabble here in northern Eregion, ${PLAYER}, but their true purpose is only beginning to become clear.
'Recently, our scouts have indicated that a half-orc with some skill in training the worms is attempting to bend the vile beasts to his will. If he succeeds, he could build a terrible army in Eregion.
'Return to the east and look for a small range of mountains south of the road to Rivendell. Among them is Carchres. If you find Arzgât there, put an end to his vile ambitions.'
Arzgât dwells near a small range of mountains, on the hillside of Carchres south of the road to Rivendell, east of Gwingris.
Calelloth has instructed you to go forth and defeat the half-orc Arzgât.