How can you not access the Underdark when Priestess Gut holds the key?
Because navigation doesn't work. I am unable to enter any door or cave entrance which exits me from the goblin base. I am instead forced into the same 'thank you dialogue' with Halsin and regardless of the variants on that conversation I exit back at the door. When I attempt to again access the next area, I am again met with the dialogue cutscene. I tried using the map to exit and even tried going to camp, going back to druid circle, etc. I've even proceeded past the celebration party. However, as soon as I enter the goblin camp to transition to the temple to unlock access to underdark, Halsin is back with me as a guest and I can't get rid of him. As such, whenever I again attempt to navigate through the door to the next part, the same dialogue.