From publisher blurb: This is an adventure for 5th Edition Dungeons and Dragons. Danger lurks in every city in the realm. But beneath the city streets lies a world far more dangerous than the streets above. People who venture into this world are often never heard from again. Almost every major city has a sewer system. The one provided in this adventure is usable in just about any fantasy city. It is a series of connecting tunnels that can be used in just about any order. They are interchangeable and one can include or exclude them as needed. There are several parts to this adventure for different levels of challenge. Many different adventures into the sewer system could be done at various stages of character development.