Escort Anchorite Truuen to Uther's Tomb in the Western Plaguelands. Afterward, speak with High Priestess MacDonnell at Chillwind Camp in the Western Plaguelands.
Now that you've recovered the Mark of the Lightbringer, all that is left is to return it to Uther's Tomb.
Would you be willing to accompany me there to do this? It's not far and I would enjoy your company. Afterward you can come back here and relate the experience to High Priestess MacDonnell.
What say you, [player]?