It is depicted as being the third planet colonised by Humans. It is known for its extreme climate, tidal surges and general bleakness, and is therefore much less populated than the other planets colonised by humans, Tropos and Radix. Most Humans are research scientists or technical staff, with Halmuris serving merely as a staging post for the first Human expeditions to Arcadion, homeworld of the Arcadian Empire, which soon invaded and occupied Halmuris and the other Human colonies. Most of the Arcadians living on Halmuris are of the cerebral Central species, most certainly due to the scientific establishments present on the planet. Not much is known about the Human underground here, but there is a presence.