What is the use of Fallout 3 World of Pain mod?

Just added some areas that can be explored. Some locations can be experienced by yourself based on notes and stories in the terminal. At the Cooper Hotel, you can receive a mission to collect turpentine, find his companions, and kill Officer Talon (not displayed on the task bar). The main mission is that the protagonist discovers a man named "Zeus" who delivers supplies and equipment everywhere. , there are notes attached to these supplies, asking everyone to come to an armory. Then go in and explore