The location the Divination leads you to is different each time you zone into Sparkfly Swamp. The proximity indicator will fill to indicate you are on the right track, initally blue and turns red as you get even closer. Once it fills completely, the Facet of Death will spawn. See the Facet of Death section for possible spawning locations. The boss should not be much of a challenge provided you don't accidentally aggro a nearby group. Unlike other Facet quests, the Facet of Death seems to spawn on one point much more often than on other points.