Barbarians and Orcs
The role of the barbarians is to serve as opponents to the Empire. There will be several distinct Barbarian powers: tribes, nations or kingdoms as appropriate. The primary requirement of barbarians is to look cool in massive numbers in battles, to provide immersive, exciting, dramatic combat encounters, whilst allowing for a full range of interaction when it is appropriate.
Most of the Barbarians powers that surround the Empire are orcs, not humans. Other races exist in the world that will be described in the final setting. Players will encounter representatives of these powers over time.