Spheres of Influence The Spheres of Influence were the twelve domains of politics and power in the Sith Empire . Each of the twelve Spheres , also known as Pyramids , were headed by a member of the Dark Council , and between them they encompassed the entire Empire . Through the Spheres , the Dark Council controlled and oversaw the day - to - day operations of the Empire , and every individual and organization within the Empire ultimately answered to at least one of the Councilors through the hierarchy of the Spheres . History and overview . In 4980 BBY , the Sith Emperor reestablished the Sith Empire on the planet Dromund Kaas , where they would be safe from the Galactic Republic . Not long afterwards , the Emperor created the Dark Council , a group of twelve Dark Lords of the Sith who would handle the day - to - day running of the Empire as the Emperor gradually retreated into seclusion . Each Dark Councilor took an aspect of the Empire as their own to rule , ranging from joint control of the Imperial Military to the judicial regulation of Imperial society to the ensuring that the Sith Order remained loyal to Sith philosophy . Every Councilor ' s successor assumed control of their respective Sphere of Influence , and every organization , group , and individual within the Empire — whether they were Sith or not — ultimately answered to one or more Dark Council member . The Spheres occasionally overlapped , causing conflict between the various Council members , but overall each Council member was responsible for overseeing their own Sphere and dealing with any problems that arose . The Spheres . Ancient Knowledge . The Sphere of Ancient Knowledge was charged with the protection and expansion of Sith knowledge . First led by Darth Zavakon , the Sphere oversaw the Imperial Reclamation Service and ensured that Sith artifacts and archaeological discoveries were handled correctly and benefited the Sith Order . Darth Arctis was replaced by Darth Thanaton as head of the Sphere near the end of the Cold War with the Republic , and Thanaton himself was succeeded by Darth Nox after the latter defeated the former in a duel . Biotic Science . The Sphere of Biotic Science was charged with the command of all aspects of the Empire that dealt with the organic body . The Imperial Medical Corps , cybernetic augmentation , disease control , Sith alchemy , and genetic manipulations and experiments all fell within the Sphere ' s control , and Darth Acharon himself had augmented his own body with cybernetics by the time he led the Sphere near the end of the Cold War . Defense of the Empire . The Sphere of Defense of the Empire was concerned with the direction of the Imperial Military in order to preserve the Empire and its people from external and internal threats . As a result , the Sphere shared joint control of the Ministry of War and the Imperial Military with the heads of the Spheres of Military Offense and Military Strategy , and it often coordinated its efforts with the Sphere of Imperial Intelligence . Darth Marr , the head of the Sphere during the Great Galactic War , the Cold War , and the Galactic War with the Republic , felt that it was his duty to protect the Empire against both the Republic and the Empire ' s own self - destructive policies and infighting like that which plagued the Dark Council . Expansion and Diplomacy . The Sphere of Expansion and Diplomacy oversaw the expansion of the Empire ' s borders and directed the Imperial Diplomatic Service in its efforts to secure new allies and maintain their allegiances . While the Sphere controlled both diplomacy and expansion , the Sphere ' s leader determined which of the two the Empire favored during the Councilor ' s tenure ; Darth Ravage , the Sphere ' s leader by the time of the Cold War , preferred military expansion and conquests over diplomacy in order to further his own interests . Imperial Intelligence . The Sphere of Imperial Intelligence oversaw the Ministry of Intelligence , with the Minister of Intelligence reporting directly to the head of the Sphere . All of Intelligence ' s many divisions , including Imperial Intelligence — the primary Intelligence gathering arm of the Ministry — and the propaganda - generating Outreach Bureau fell under the control of the Sphere ' s leader , and Darth Jadus involved himself directly in the workings of Operations Division of during his time at the head of the Sphere . Following his presumed death with the destruction of his flagship , the " Dominator " , Darth Jadus was replaced for a time by his daughter and heir , Darth Zhorrid , though it is unknown how long she lasted , given the enmity she received at the hands of the rest of the Dark Council , nor who , if anyone replaced her ; the seat was empty at a meeting a few years later . Laws and Justice . The Sphere of Laws and Justice directed the law enforcement and justice branches of the Empire , and under the Sphere ' s control the rigid order and efficiency of Imperial society remained intact and Imperial justice was maintained across the Empire . Darth Mortis , the head of the Sphere by the time of the Cold War , ensured that the Empire remained true to its values and traditions , but understood that relying too much on the traditions of the past could compromise the future . Military Offense . The Sphere of Military Offense directed the Imperial Military and the Ministry of War in all offensive military operations , commanding the military ' s firepower and resources in order to destroy the Empire ' s enemies and ensure their territorial and military supremacy . Darth Vengean ' s elaborate plan to restart the Great Galactic War was usurped by his apprentice Darth Baras before Vengean ' s death , and Baras ' machinations to become the " de " " facto " ruler of the Empire by declaring himself the Voice of the Emperor resulted in Baras ' death as well . Baras ' successor Darth Arho commanded the military on Ilum as Grand Moff Ilyan Regus ' s superior , but he was killed by the Republic forces on Ilum . His successor , Darth Arkous , took part in Revanites ' coup and was killed on Rakata Prime . Military Strategy . The Sphere of Military Strategy controlled the battle plans , strategies , and other military procedures in addition to the Imperial Conquest Consolidation Corps , and the Sphere worked directly with the Spheres of Defense and Military Offense to command the Ministry of War . Darth Decimus and the Sphere orchestrated the invasion of Corellia during the renewed war with the Republic , resulting in a near - perfect occupation that was only foiled by the unexpected reactions of many Corellians and the formation of a resistance to the Imperial presence . Mysteries . The Sphere of Mysteries , also known as the Keeper of Mysteries sphere , was the Sphere that was the most secretive of the twelve . The rest of the Empire knew almost nothing about the Sphere ' s inner workings or purpose , and they only understood that the mysteries which the Sphere protected were important to the Empire . Darth Rictus was the head of the Sphere during the renewed war with the Republic . Production and Logistics . The Sphere of Production and Logistics was charged with overseeing the Ministry of Logistics , with the Minister of Logistics reporting directly to the Dark Councilor in charge of the Sphere . Through the Ministry , the Sphere oversaw the Empire ' s trade routes , resources , economy , military supply lines , transportation systems , nationalized industries , slave populations , and other assets and programs essential to the continued functions of the Empire . Darth Vowrawn headed the Sphere throughout the four decades of conflict with the Republic . Sith Philosophy . The Sphere of Sith Philosophy was tasked with the protection of the Code of the Sith , ensuring that the acolytes and apprentices of the Sith Order remained loyal to the tenets of their Order , spreading anti - Jedi teachings and propaganda , and also ensuring that the Empire remained free of those who believed in the powers or advantages of the light side of the Force . Darth Aruk made it his personal mission to destroy the Order of Revan and the mysterious Light Sith during his time at the head of the Sphere . Technology . The Sphere of Technology oversaw the creation of powerful new cybernetics , superweapons , military technology and other revolutionary machines for the good of the Empire . The Sith Lord Darth Mekhis helped design the " Fury " - class Imperial interceptor in the years before her ascension to the head of the Technology Sphere , and during her time at its head she developed the powerful Sun Razer and many new superweapons before her death during a Republic SIS operation . She was succeeded by her rival Darth Hadra , but after her death at Corellia the Falleen Darth Karrid — commander of the prototype warship " Ascendant Spear " took her seat for a short time before Karrid ' s own death . Karrid was succeeded by Darth Acina , who was chosen by the Emperor ' s Hand to oversee the " Arcanum " .