Slaver's Exile bug

I just killed Selvetarm and got the chest, but the quest didn't update. AmI going to have to do it over again?

What quest are you referring to? If it's for The Last Hierophant, that will not clear until you kill Duncan. If you look at that quest, it should show a list of all the pre-bosses you have to complete before accessing the final boss. The boss "Selvetarm" should be crossed out after you killed him.

That's what I mean, "Selvetarm" is not crossed off. All the others, except of course for Duncan are crossed off.

I just did it this evening and it marked off, just like the other dozen times
I've done it. and like the times when 10's of thousands of others have done it
too.

You could be mistaken.

I remember at least one of those bosses have groups that rez, so kill the group and stop any rezzing to get it

I agree with the above. I had the same problem with one of the bosses because they countiued to rez him.

Just did it again and this time quest updated (Selvatarm crossed off) and chest appeared, before everything was dead. I just don't get this dungeon. Anyway, I can go do Duncan now.