The known world, before the conquests of Kyros.
Terratus is the world. Most, if not all of it, is under Kyros' control following the conquest of The Tiers.
Terratus the planet has two satellites visible by the naked eye - the tide locked Terratus Grave and the rapidly orbiting Interloper. Scholars have long studied the effects of these two moons on the ocean currents, and a great deal of folklore concerns the origins of the moons. A common belief in Kyros Empire is that Terratus Grave will finally set on the horizon when Kyros' rule ends, whereas those of the Tiers insist the moons are older than the Oldwalls and will outlive even Kyros.