It has only one objective – to slay Mor’geth. It is marked as completed (because i slayed him) and keeps staying as incomplete not disappearing from map and not granting reward anima.
We’ve seen a few reports of this, and are looking into this from our side. In many (although sadly not quite all) cases the quest seems to resolve and trigger the Anima-reward upon re-entering the related area.
If that is not the case: another kill of Mor’geth generally does the trick, and I’m sure he has it coming anyway!