Mine showed the quest marker for all three even after all were dead. To complete the quest, you have to walk up to Halsin and talk to him one final time. For me he was in the main chamber with the hardest boss, because he came with me. If you left him at the cells, maybe he has gone back to the Grove.

I left my game yesterday after casually running out of the camp straight into a small army of goblins + a giant goblin, dying after a 45 min battle, then realising I’m going to have to be smarter to escape. Maybe there’s a less-heavily-guarded exit.

The markers were still there for me as well, but did you save Halfin yet and talk to him after killing all 3 bosses?

Try talking to Halsin again. It still showed the markers for me as well, but talking to him progressed anyway.

Whenever I got issues with quest markers not updating or required items missing I reload, maybe restart the game. That can fix it.

I wish I could help. I never actually found him; he just showed up at the Grove after I wiped out everything in the goblin camp and went back to sell everything before actually looking for him.

I will say that sometimes you can just reload a game (doesn’t have to be an earlier save or anything just save and reload where you are if you want) and it fixes a ton of scripting related bullshittery like this. Any time I notice a script failing to fire (like a line of dialogue not playing, or the enemies get stuck just standing around in combat never actually taking their turn), I quick save, quick load, and it’s usually fixed.