A trove is a landmass formation accumulated between two permanent Aurora clusters, the Crown Aurora and the Pedestal Aurora. Troves are commonly roughly disc-shaped and may vary in diameter from a few to several hundred plethrons (kilometers).

Troves gravitate and rest upon the more powerful Aurora cluster which in Horizon’s geology and astronomy is described as the trove’s Pedestal Aurora. Troves are the only habitable surfaces in the Horizon and all land-based species, including humans, live on them.

There are 50,000 troves scattered throughout the Horizon. 10,000 are inhabited. Among those there are ten cradle troves. These are the cradles of human civilization and the motherlands of the ten human breeds.