The majority of Numen the Slayer takes place in the northernmost kingdom in the Caliburn Empire, Umbran. I named this kingdom after the ancient Anglo-Saxon kingdom of Northumbria. It is a region that is geographically isolated because it is surrounded by mountains in the north and east as well as swamps in the south. Its climate is similar to northern England and Scotland, being cold and temperate. Within its natural defenses, Umbran consists of fields, hills, and lakes. To the far north is an uncharted region known as the Territories, which is home to several monsters. It is divided up into eight baronies, each one with their own collection of landed knights. Like all the other kingdoms in the Empire, Umbran is ruled by its own royal family, House Baal, who rules the capital castle of Blood Arrow. In times of war, Umbran’s maximum military strength is around 35,000 strong. In addition to being inhabited by civilized people, Umbran is also home to tribal barbarians called Welts. Overall, Umbran is a dark and wild kingdom that breeds savage people.