Vayr is the fifth largest of Bax's moons and the smallest of the Baxian Quintet, with a mass 0.52 times that of Mersia. It is a rocky planet with a high iron content in its core, resulting in an unusually small diameter for its mass, and giving it a surface gravity of 7.8 m/s^2. The planet has unusually complex geology, with an intricate system of caves permeating its crust. It has a relatively thick atmosphere of 72% nitrogen, 26% oxygen, 1% argon, and 1% trace gases including carbon dioxide, water vapor, and hydrogen. It is close enough to Bax that it receives a significant amount of radiation from its surface at all times, resulting in an average surface temperature of 63 F.

Unmanned explorations of Vayr have revealed the presence of both Uranium and Thorium ores. It is a candidate for manned exploration due to its breathable atmosphere, relatively stable temperature, and availability of the caves for shelter when Bax approaches Eliar. It may be possible to establish a permanent colony here, using the relatively abundant uranium and thorium to generate electricity for the colony in place of stellar power. Unsatha remains a better candidate for establishing a second civilization, but Vayr may be used both as a mining base, and as a mid-point for future missions outside of the Ixar system, providing both a surface with lower gravitational forces and a ready source of gravitational assists in the nearby Bax.