Arkenos is one of the moons of the gas giant Pressen. It is approximately earth-sized. Every 1000 years its orbit intersects that of Jenoa and the two moons pass close enough that their atmospheres mingle, allowing transport from one moon to another. Arkenos is not tidally locked to Pressen, as Jenoa is.

From myth and legend, it appears that the two moons have similar races on them, but Arkenos is spoken of as a harsh world, its people maddened by few resources and hardened by constant war.