Head east from the Aman'lu teleporter and down the ramp, then take the pathway south to the Pet Shop. Enter and speak to Pet Seller Galeron and ask him if he has anything special. He'll eventually send your party off in search of Khartos the Wise. Return to the teleporter and head for Kalrathia. Head east down the stairs from the Kalrthian teleporte, then take the southeast stairway down to the ground. Head south into the tavern, where they'll encounter Khartos the Strong as they walk inside. Ask him if he's Khartos the Wise, then if he has information on a silver horned creature. One he says they'll have to fight him to get him to help, do so and he'll concede that perhaps you can handle the Morden and gives your party directions to the Kalrathian rift site.

Return to the teleporter and travel to the Northern Plain of Tears. Head temporarilly south toward Kalrathia, then turn west just before reaching the large arch. Turn northwest and walk to the left behind the ruined building. Continue north toward Khartos, whose orange qeustion mark is clearly visible ahead, and the rift site beyond him. Speak to him and he'll tell them to keep the attacking hordes away from him while he summons the Mythrilhorn, whereupon a horde of Durvlas will attack. Destroy them all and a tamed Mythrilhorn will appear. Collect the nearby treasure and speak to Khartos to learn that he's taking up the study of Magic again, and sending the Mythrilhorn straight back to the Pet Shop in Aman'lu.

Teleport back to Kalrathia either by using your mage's teleport ability or heading back the short distance to the Northern Plain of Tears teleporter. Once there teleport back to Aman'lu, where you'll note a star on the small compass. Head east from the Aman'lu teleporter and down the ramp, then take the pathway south to the Pet Shop. Enter and speak to Pet Seller Galeron to receive your reward and complete this quest.