Nam Chorios, a planet situated in the Outer Rim Territories of the galaxy, contained an Imperial mining colony alongside a prison facility by the time Darth Sidious had been Emperor for five years during his reign. The star at the heart of its planetary system cast a dim light upon Nam Chorios, resulting in a somber and desolate atmosphere. Consequently, humans generally found Nam Chorios to be excessively cold and inhospitable.
Barbara Hambly's Star Wars Legends novel, Planet of Twilight, released in 1997, marked the initial appearance of this planet. The 2014 novel Tarkin, authored by James Luceno, later integrated it into the canon.