Deep within the Allied Tion sector lies the ancient and mysterious planet of Voss. It is a terrestrial world of vast mountain ranges and verdant rolling plains, separated by a deep blue ocean that bisects the globe across the northern hemisphere. Patches of woodlands where trees with twisted and gnarly bark grow dot the wide open fields such as the Pelath-Ri Marches or the Old Paths, where many ancient ruins of cities and temples still rise out of the ground like the bones of a dead giant. The four-legged, multicoloured creatures known as mawvorrs prowl the edges of the forests, while packs of nexu ambush unwary pilgrims who make their way to the mystical Shrine of Healing, an ancient and revered temple of the native population where their most talented healers tend to the wounded and sick.

Voss is inhabited by two sentient species, namely the Voss and the Gormak. Ancient tablets speak of a time when the two races were one and the same, but a terrible war between the Jedi and the Sith waged across the planet's surface caused the natives to fracture and splinter into two distinct peoples. The Voss retreated high up the mountains, where they built marvellous and resplendent cities such as Voss-Ka and adhered to the will of their Mystics, Force Sensitive seers of tremendous prophetic ability. In turn, the Gormak populated the open plains and grasslands, and became proficient in manipulating technology and using it to cybernetically enhance the vorantiki, fearsome towering creatures that the Gormak turned into beasts of war. For generations, the Voss and the Gormak viewed one another as mortal enemies and waged an endless war, with each side of the conflict vowing to destroy or contain the other. It was only after the Great Galactic War between the Republic and Sith Empire that the Voss and Gormak reconciled to a degree, in an effort to protect their planet from outside influences in the millennia that followed.

One of the most notable and mysterious places on Voss are the Nightmare Lands. Born of the Dark Side of the Force itself, the region of corrupted woodlands and maddened beasts was said to once have harboured a terrible entity known as Sel-Makor. Ancient historical records detail a battle between the Dark Side entity and a champion of the Light, in which the latter permanently vanquished the former. Yet, the lands Sel-Makor had claimed for itself have remained tainted since, and many who wandered within these woods were lost to insanity forever, with even the best Voss healers being unable to restore their shattered minds. It is why many Voss and Gormak cities, as well as later settlements of Tionese offworlders, were built far away from the Nightmare Lands, with few daring to speak of the horrors that still lurk within its shadows.