The last quest in the Ranyon-Ruhn Temple questline still leads to a dead end - “go to Necrom, the Holy City of the Dead, and report there that a cult of Molag Bal has been discovered” – with nobody to talk to. It can either get temporary closure or stay unfinished for the years to come.
Solutions in order of increasing effort:
- remove the line that tells the player to go to Necrom and report something, since there is nobody to talk to there
or - add generic dialogue in Necrom directing to a NPC, and dialogue from the NPC acknowledging the report (and in the future pointing to the Necrom Temple quests/initiation if not yet found)
or - as above, and if/when the player is of high enough rank or level, give a quest to clear out that cult's underground lair (interior available, place somewhere and add enemies)
or - as above, but having to talk to scouts/witchunters and track down the location first