Dark Castle quest not completing after, umm, it's completed

[gavrushka]

I talked my way past the vampire lady, made it through the maze to the befuddled old geezer, and intimidated him into giving up the 'necromancy' gem. - Party had a discussion saying they should ask legacy council before doing anything with it, but a trigger must have been missed because the quest still shows 'follow your intuition' and hasn't progressed even though it has completed. Character now has the crown powers granted by the second gem, but the legacy council is closed and the Lord dude in the Inn is unclickable. - I've completed all sidequests, so I'm stalled...

[Shadow]

Are you sure you didn't open up a second gem location on the map, and the quest now says to go to the "monastery"?
After doing the dark castle I also thought I should go back to the council for some story, and for a minute thought it was bugged, until I noticed there was a new area on the world map.

Edit: It's possible I wasn't paying attention properly, but it did seem to me that the game was missing some dialogue snippet here.

[gavrushka]

I did check the map, but there are no other locations, and the quest status remains on the dark castle location. - Yeah, the dialogue was a little misleading, suggesting I should do nothing until I returned to the council, but the quest simply has not progressed. - I might try returning to the castle, but have no idea what more I can do there...

[Shadow]

Maybe try reloading a save from before you intimidated the old necromancer, see if it happens again?

[gavrushka]

It does look like that's what I'll have to do. - I've returned to the castle, and returned to the room he was in, but it's empty. - There is one thing - a locked room in the corner that I've never been able to get inside.

I'm not sure if I have to report this as a bug elsewhere, or if the devs pick up on these threads.

Thanks for your responses. They're much appreciated.

[gavrushka]

Originally posted by Shadow:

Maybe try reloading a save from before you intimidated the old necromancer, see if it happens again?

Retry didn't work, so I guess something went wrong far earlier in the quest. - I made sure 'track quest' was active, but it made no difference. - I don't have the heart to go back to a save pre dark keep quest, so I'm just praying the devs fix it before too long. (I noticed other threads with people reporting the same issue...)

[Flashpoint]

Since this thread is one of the top search results for this bug, the solution is as follows:
- Download and install the Unfinished Business mod
- Enable the Debug overlay from the mod settings page once the game launches
- Open the overlay once you're in the game in a map, not the overworld (Ctrl + Shift + D)
- Go to the Quests section and select the main quest in Active Quests
- Scroll to the bottom and check the box for the Dark Castle Complete step
You should now get the new map location unlocked when you return to the overworld and be able to proceed.