So I did this quest a little while ago and I burned the remains in the Eternal Fire but the quest wont close. I don't believe I used Spirit Vision first which is probably what did me in. However, my journal even says that I burned the remains so I know I did that part properly. It also says I now have to return to Vilnx Creeva. I tried using Spirit Vision at Creeva's grave after the fact but he doesn't show up.
Is there any way around this or did I royally screw this up and just have to move on?