Hey I have a problem. I just spent like an hour getting a party for and another hour fighting the Jotun Dungeon. We hadn't done the Winterdeep and whatever it was Warrens yet. We fought all the brothers. But when we were done with this extremely difficult fight, it still said I had to defeat Jotun. Idk why and I was hoping someone could help me.
Dude,dude dude, you kill his brothers to make them not appear when you fight against jotun, if you do not kill them then they will be in the fight making it next to impossible to defeat him...
If Jotun dies, and then you die, flee, and port back, you will not get quest credit, because you will have technically joined a battle without the boss you have to beat.
I had the exact same problem. Save Jotun for last when you're fighting him, or make sure you have a healer when you do.
The same thing happened to me when I was fighting the Coven. I found out that between my defeat and my return, my friends had killed Othin already. When the battle was over, my quest said I still have to defeat Othin. This could be your problem.