@beastyality Sorry to hear that. I don't think there's any DLC required. It's a short little campaign. Should be able to finish it in under 2 hours.

Do you need the Lost Valley DLC for this? I started this adventure with some friends, but can't load our saved game. It says I'm missing the DLC, but I was somehow able to play it at first.

This was short and sweet adventure. The encounters were fair and you had to be strategic. I have played a fair amount of custom dungeons and this one by far; is one of the best with battle field layout. The typical encounters I have seen are a big, wide open room filled with monsters. This had more of a battle field terrain in a forest, where you could take advantage of cover and line of sight. Look forward to other one shots that take an hour or two to complete.