We played this last dnd session during a camp out in the woods, on the blackest of nights, in an abandoned campground at the end of a healthy hike.
The black dog-like creature, Larry, was officially accepted into the group, despite worries about his deep bloodlust.
One player attempted and failed a solo rescue of the captured player after witnessing one of the horrifying fates for duregar prisoners. Both players were imprisoned.
The player performing reconnaissance of the war camp saw the efficient cruelty of the duregar, and a possible way out of the cavern. She went back to the last free player. After the duo scouted a sweltering lava tunnel, they met a peculiar, dangerous creature, ostracized for some reason from his hive. They promised to reunite him with his people and kill the entity enslaving them, if he would help them free the captured players.
This creature showed them a hidden passage to where he “stole his food” from the duregar.
Once free and reunited, the party rescued the rest of the terrified prisoners, sending them out to be killed by the duregar while they and their new companions made their exit.
By this time, the game devolved into watching the fire burn down before stumbling to bed.
The Tome of Adventures 