For generations, the Durins have been isolated due to geographical situations, making them not eager to explore the surface world. But modern Durin historians unanimously agree that their sudden interest originated from a mine expedition. Centuries ago, the industrial representative of a certain Durin city-state discovered a mineral vein just above their city's dome. In order to mine the vein, the Durins built the very first lift within their city. Slowly and gradually, these lifts became a convenient way to reach the outside world, thus establishing their connections with the land-dwellers. Even though nowadays more and more Durins have come out to the surface world, most of them did it only for the sake of curiosity and fun instead of exchanging their culture and technologies.
Thanks to the Durins' peaceful nature, very few wars or bloodsheds have ever happened within their homeland. Despite its outward peace, however, the underground world is never a safe place. Natural disasters such as flooding by underground water, boulder collapses, and even expanding Originium veins are common threats to the Durins. In the meantime, it is even said that an ancient, hidden danger is buried inside the underground world that both the Durins themselves and the surface dwellers are unaware of.