After the fall of the Exekian Empire, the survivors scattered in the dangerous Shadowlands. Numerous groups formed among them and began vying for power.
Callisto had been exiled to the south centuries ago, and as a result knew the terrain well. She gathered followers who were unaware of her past.
Apollo, who only recently arrived at the Shadowlands after decades of wandering the ruins of the Old Exekian Empire, was the first to join his fledgling faction in allegiance with Callisto, officially forming the New Exekian Empire.
After the formation of the Clan, open warfare ensued between the two factions.