After accepting this quest, Hareh will start following you. Lead him to the area containing the five gravesites as indicated by the quest marker (he is immune to the Sulfurous Haze environmental effect). You do not need to click on the gravesites, but you must approach each gravesite in a specific order as indicated by the quest marker. Note that you may have to go past a gravesite to get Hareh close enough to trigger his use of his Rise From Your Grave! monster skill. Once you've repeated this for all five gravesites, the quest is complete.