I restarted the Tusks storyline from an earlier save. Instead of just jumping into the main story I worked on side missions until I was able to complete Marius' story. After that I ran the Dreams Still Divide, and it progressed with no more issues.
I restarted the Tusks storyline, and completed Marius' companion quest this time before facing Lodwyn. It let the quest proceed as it is suppose to. First time I just played main story and found the big.
I'm having the same issue. No matter how slow or quick I kill everything the game will not progress. It's almost like there are a few dreamthralls stuck where they can't be reached