The young man that eventually became Darth Callidus was born on his family's homeworld of Arcis, an Imperial Fortress world and the center of a secret supply-line connecting Dromund Kaas to Thule nestled in the heart of Stygian Caldera, long before the production of the Infinite Forge the Arcis system was still a major contributor to the Imperial War Machine with it containing its own Sith Academy, Imperial Military Academy and countless Weapon and Ship Production facilities thus Callidus was born at the center of all the militant chaos of the system.