Karthis Darkrune

Karthis Darkrune is a night elf death knight located in the Plaguewood of Eastern Plaguelands under the command of Aurius Rivendare. He and Omasum Blighthoof are guarding the entrance to Stratholme. They received a letter from Baroness Anastari, claiming that if they keep the plaguewoods secured, they would earn a new comrade.

Objective of

 * Guardians of Stratholme

Speculation
It is believed that Omasum and Karthis were some of the people who aided Aurius Rivendare and died with him on his quest to redeem his father.