Phobos is the larger of Maerth's two moons. It orbits Maerth three times a day, and is so close to the planet's surface that in some locations on Maerth it cannot always be seen.
The barren rock of Phobos has been carved hollow by mankind and reinforced with metal. The moon is ringed by two huge dockyards, which run perpendicular to each other, which serves as the headquarters of the United Human Defence Board (UHDB)'s Maerthian fleets. A quarter of the moons rock belongs to Afri-Zen Synthocracy while the remainder of the moon is shared with other Maerthian powers.