Fort Nyx is a garrison base in the lowlands north of Ares continent, roughly 50km off the northern edge of the midlands. It is one of three garrison bases along with Fort Enyo and Fort Bia, and the three double as training grounds for the Strata Military Academy.
The core of the base is built into a ridge of hills and rock outcrops, and now surrounded by VTOL and Airship landing areas on both sides of the ridge. Fort Nyx is the main airbase for military airships on Strata. A series of gun emplacements and bunkers (both free-standing and built into rock outcrops) around the base is the primary outer line of fixed-defences. The base itself is similarly guarded by bunkers and gun emplacements built into the ridge. The base also contains significant military forces, intended to defend and/or retake Ares continent from invaders, as well as reinforcing Fort Enyo from a concealed location if needed during an invasion.
The base is used for cadet training, and is the likely source of rumours about a hidden Tartarus Base and Hades Base concealed deep within the lowlands somewhere on planet Strata. One of the main training programs is to have cadets use mining mechs to excavate and tunnel to expand the subterranean areas of the base. The other is using the surrounding lowlands for large scale training operations and battle simulations in poor conditions. Training aircraft pilots at Fort Nyx to navigate in fog has proven vital for military aircraft use on the planet.