Endurance is one of the seven SPECIAL stats in Fallout Shelter, which determines how many hit points dwellers gain as they level up. It is also the assigned skill for the storage rooms, although it will have no effect on those rooms. Endurance is important for dwellers who are sent out to explore the wasteland, as it increases their health and allows them to survive longer in the harsh environment. Additionally, dwellers with high endurance are better suited for combat and can take more damage before being defeated. Therefore, it is recommended to train dwellers endurance before sending them out to explore or fight in the wasteland.