A short passage beyond the portal leads to a small chamber at the top of a deep shaft. A slight breeze wafting from the depths indicates that there is at least some airflow down below, and the rungs built into the side of the shaft seem sturdy if not a little rusty.
After a long, arduous climb, the party finds themselves in a roughly-hewn, rubble-strewn chamber with a tunnel leading further into the darkness. They follow the passage until it opens up into a vast cavern. Before they can explore further, however, several swarms of hungry centipedes detect them and attack. Defeating the vermin is no easy task, and the party retreats to the top of the shaft to rest.