Outcasts ( Taris ) The Outcasts were citizens of Taris that had been banished to the Undercity of the planet . They and their descendants were forced to live in dirt and filth , while having to beg for and steal food and clothes . The Outcasts lived in constant fear of the rakghoul s — mutant s which could spread their infection to anyone . History . Origins . When new , smaller trade routes moved from Taris , rendering the planet unnecessary and without the support of the Republic , the planet began to fall into ruin and despair . The great city of Taris covered more than half the planet ' s surface , so the kelp harvest and the creatures of the sea were the only native food source . Abandoned by the Republic , the Tarisian industrialists began to use certain power sources that would have been illegal under the jurisdiction of the Republic , which produced toxic waste as a byproduct . The pollution poisoned and killed most of the oceanic flora and fauna , leaving the planet with no reliable food source and beginning a famine . The Tarisian elite hoarded the remaining food and wealth for themselves , while the poor were left to starve and die . The Tarisian poor rebelled , and began the Tarisian Civil War . Millions died and large sections of Taris were destroyed or abandoned . The location of the only known self - sufficient part of Taris , known to the Tarisian poor as the " Promised Land , " was lost . The rebellion was eventually crushed , and the thousands of remaining disarmed rebels were imprisoned . However , the jails were not large enough to hold them all , so instead they were banished to the Undercity , unable to return to the surface under penalty of death . Life in the Undercity . All hope was lost to the defeated rebels , save from one ; the Promised Land . It was the hope that one day they might find the Promised Land that motivated the Outcast to carry on . In the meantime , Gendar ' s ancestor led the Outcasts to build the Outcast village in which they might survive that was by an elevator to the Lower City . The prisons in the Upper City were rendered unnecessary and any criminals in the Upper and Middle City were banished to the Undercity . Here , walking the original surface of the planet that never saw the sun due to the shadows of Taris ' massive skyscrapers , they endured a lifetime of horror marked by starvation , rakghoul attacks and rakghoul infections . Even their descendants were forced to live in damnation . As the generations passed , fewer and fewer Outcasts believed in the tales of the Promised Land , thinking them to be fairy tales meant to prevent the Outcasts from going mad from despair . In the year 4056 BBY , non - Humans were also banished and forced to live in the slums of the Lower City . Thus the law enforcement of the corrupt government enforced strict socioeconomic divisions upon the people of Taris for ninety years , from 4056 BBY until 3966 BBY . During this time Rukil ' s grandfather searched for clues about the Promised Land , but was killed by rakghouls in the Sewers . Rukil ' s father did the same and found more clues about its location , but he met the same fate . Mandalorian Occupation . When the Republic eventually dissolved the corrupt Tarisian government in 3966 BBY , the Outcast ' s banishment was ended . However , Mandalorian attacks on Taris obstructed further efforts to emancipate the Outcasts . In 3964 BBY , the Republic reluctantly abandoned the planet to the Mandalorians and the Outcasts were once again forced to live in damnation . Even when the Mandalorians eventually withdrew from the planet in 3960 BBY , the Outcast ' s lives did not improve . Sith Occupation . During the Jedi Civil War , in 3956 BBY , the Republic returned to the planet to finish the job they had begun during the Mandalorian Wars . In the Upper City , Republic scientists developed the Rakghoul serum , a cure for the horrifying disease that plagued the Outcasts which was duplicated many times . The Republic was about to tighten the socioeconomic divisions once more when the Sith invaded . During the Sith occupation , all followers of Rukil had abandoned him save from one , his apprentice called Malya . Rukil , who was too old to search for clues for the Promised Land , sent Malya to look for more . She indeed did find more clues , but she was killed by rakghouls in the Undercity surface before she could return to Rukil . The Sith tightly controlled the use of the rakghoul serum , giving doses only to themselves and to their Undercity patrol . By the time Revan entered the Undercity , the Sith had practically run out of the serum altogether , though some of the Sith trooper s killed by rakghouls would occasionally have a sample of serum on their corpses . When Revan arrived at the Undercity , he was able to save the Outcasts from the rakghouls by giving a rakghoul serum vial ( found on the remains of a Sith Trooper ) to an Upper City doctor , Zelka Forn . Forn was able to reproduce the serum , and used it to cure the Outcasts of the disease and Esala , the village healer , was given hundreds of vials from Zelka Forn . Revan also met Rukil and helped him discover the Promised Land . Revan found journals belonging to Rukil ' s grandfather , father and apprentice Malya in and around the city sewers . He then gave the tomes to Rukil , who in turn gave them to Gendar , who used them to discover the location of the Promised Land and led the Outcasts from their village . Journey to the Promised Land . The Outcasts were able to survive the bombardment of Taris while traveling through the Tarisian Sewers where they found no survivors other than themselves , Gammorean s or otherwise . A few months after the bombarbment , the Outcasts ' exodus from their village to the subterranean realm known as the Promised Land was complete . Unfortunately for the Outcasts , this was the time when Darth Malak ordered a massive orbital bombardment of Taris - which also led to Rukil ' s death . It was discovered by a group of heroes during the Cold War that the Outcasts had in fact found the Promised Land ; it was , however , vastly different from the legends or at least was after the bombardment . Life in the Promised Land . The buildings , equipment , generators and possibly droids had been destroyed , and therefore the Outcasts had to start over . Whilst being a difficult task , they had survived the bombardment . However , many generations had passed since then , each having a " Promised One " , who would keep the memories of the terrible apocalypse and be in charge of the colonists . The anti - rakghoul serum which Revan discovered was enough to protect the first few generations , but after the rakghouls evolved to be immune to it , it was obvious the vials became useless and that babies couldn ' t be born immune and some Rakghouls evolved into the Nekghoul s . Return to the Undercity and Extinction . The Outcasts later left the Promised Land and recolonized the Undercity and renamed themselves the Tarisians . This was in vain , however , as the Tarisians continued to die out on the surface from starvation , diseases and Rakghoul attacks . It was also shown , in the last successfully preserved time recording , that the last generation alive had lost so much information about the world , they didn ' t even know how or what brought them there and the remaining members died out from toxic waste which ultimately resulted in their extinction like the rest of the planet ' s population many years earlier . The information about them was lost until a Jedi retrieved the information about their post - apocalyptic history via hologram recordings both in the Promised Land and in the Undercity and gave it to a local Republic history keeper , in 3641 BBY . Legacy . The only legacy they left behind , was a sample of a rakghoul serum which was found by pirates in Zelka Forn ' s second medical facility , which was located in the Undercity in the remains of their village and was later given to a Jedi , although the Nekghouls were technically the descendants of the Outcasts . The Jedi group then gave it to a Republic scientist so someone could alter and improve the vial from someone infected so it wouldn ' t be useless . The deed was done and the serum was produced into mass quantities for a third time . Behind the scenes . In an alternate , non - canon plotline , Revan gives the serum to one of Davik Kang ' s men for a large sum of money . In another non - canon plotline , Revan gave the three Promised Land journals to Igear , who destroyed them so that the Outcasts could never find the Promised Land . In " " , all the Outcasts within the village are human , with the exception of those bitten by the rakghoul s , however , the infected people were then quarantined away from the other members of the village .