It is a savage and mountainous world. The inhabitants are a nomadic people that follow the migratory herds of mountain Grox that were introduced to the planet long ago. They hunt the weaker Grox to eat and trade the tanned skins with other tribes when they have a surplus.
According to ancient tradition, once in every five cycles the tribes must tithe a tribute to the Imperial governors who reside in the only permanent settlements, which are huge, walled, palace-fortresses located in the valleys. When the day arrives to pay the tribute, the best shepherds of the tribe must separate a portion of the flock and lead the arduous journey to the distant valleys. The governor will select a portion of these herds for slaughter and distribution throughout the Agrippina Sector, providing food to over-populated planets. Sometimes, the tribe cannot or does not want to pay the demanded tribute; instead the youth of the tribe are recruited into the Imperial Guard.