Arx is a terrestrial planet orbiting the star Arx Major. The planet has a type I atmosphere, and is capable of supporting life. Its terrain includes a dark blue ocean that engulfes just over half the planet, with several large islands that make up three distinct continents. Lush and colorful from the concentration of greenhouse gases, the equatorial regions of Arx’s surface can be described as ranging from tropical and boreal to barren, while tectonic action has formed mountainous ridges in the center of some continents. An icy tundra at the furthest tip of the planet spills over onto the largest of the three continents.