Darropolis existed as a city situated on the planet known as Hosnian Prime. Within this city was a veteran hospital for the New Republic. This hospital is where Dade Hetkins underwent medical care, eventually receiving a cybernetic leg to substitute the limb he had lost following the Battle of Endor. The doctor named Arsad oversaw Hetkins' recuperation, and designated the prototype therapy droid QT-9 to assist. Outside the main urban area, dome-shaped Hosnian residences were constructed upon crystal dunes. During 34 ABY, the First Order utilized the superweapon housed inside Starkiller Base to destroy Hosnian Prime.