Ooroo Ooroo was a male Celegian Jedi Master who acted as an instructor to Jedi students on the planet Ossus for a long time before the Great Hyperspace War in 5000 BBY . Ooroo ' s species breathed a gas , deadly to most life - forms , known as cyanogen , whereas oxygen was deadly to them . This caused the Jedi Master to depend on a crystalline life support chamber for survival on oxygen - rich worlds . Ooroo trained many students during his time as a Jedi instructor , but the Draethos Jedi Knight Odan - Urr was by far the most well known . 5 , 000 years before the Battle of Yavin , Ooroo sent Odan - Urr to help restore peace to the Koros system , which was ravaged by a series of Unification Wars aimed at uniting the seven planets of the system . During their separation , Ooroo and his apprentice were plagued by visions of long - forgotten Dark Jedi , as well as the pain and suffering the darksiders would bring the Republic . The Celegian Jedi traveled to Koros to meet with his student . Ooroo was on the planet when the Sith Empire launched their attack on the Republic . He and Odan - Urr led the forces of Teta , the Empress of the system , on Kirrek . Teta ' s men were overrun with Massassi warriors , so the ancient Master sacrificed himself to defeat the Sith warriors , shattering his cyanogen tank and sending the fumes into the Massassi ' s lungs , killing many of them instantly . He was later known as the Martyr of Kirrek for this selfless act . Biography . Jedi Master . Although Celegian Force - sensitives were exceedingly rare , Ooroo was found to be of sufficient Force sensitivity to become a Jedi , and he was trained in the ways of the Light side of the Force , eventually rising to the rank of a Jedi Master . At a small training center on the planet Ossus , Ooroo acted as a Jedi instructor , teaching a great many students in the great library of the mountainous planet . However , unlike most species , who breathed oxygen , Celegians breathed cyanogen . The yellow gas was poisonous to most forms of life . The planet on which Ooroo conducted his teaching was oxygen - rich , which meant that the ancient Jedi Master had to live in a cyanogen - filled crystalline life - support tank , which floated several feet above the ground . However , this did not affect his ability with a lightsaber , though he rarely made use of such a weapon and preferred to avoid combat . However , when violent conflict was unpreventable , he usually utilized his variety of Force - powers . One of his students , a young Draethos named Odan - Urr , had completed his training and become a Jedi Knight , yet remained on the planet with his master . Odan - Urr was content to study Ooroo ' s mass of scrolls and documents , with a particular interest in the history of the Sith as well as obscure and little - known Jedi arts . Where many of Ooroo ' s other trainees sought to make history , Odan - Urr was far more interested in reading history . He only ever left his studies at Ooroo ' s urging , and always reluctantly . Perhaps it was because of his student ' s peaceful temperament that Ooroo decided to send Odan - Urr to the Koros system to aid Empress Teta and her Jedi advisor Memit Nadill in their efforts to defeat the remaining rebels and pirates , bringing the final of the seven planets of the system under Teta ' s dominion . The experienced Nadill would also take over Odan - Urr ' s training during his time on Koros . Odan - Urr departed for Cinnagar in a shuttle , though he expressed his displeasure in the possibility of facing combat . Ooroo told his young apprentice that a Jedi Knight had responsibilities other than reading and studying ancient scrolls . Teta had successfully united the other planets in the system , but the pirates on Kirrek had managed to fend off any efforts to fight them , and had started attacking any ship that flew within distance of their weapons emplacements . Several dozen hostages had been murdered by the pirates after the last attempt to defeat them . Teta came to the conclusion that the only way to defeat the pirates was a full military assault , and she reluctantly ordered her men to carry one out , despite her fears that many lives would be lost fighting the rebels . However , Odan - Urr managed to save a great many lives with his knowledge of an obscure branch of the Force known as battle meditation , a power which Ooroo was also capable of using . Odan - Urr helped Teta ' s forces achieve victory , and when Ooroo heard of his apprentice ' s achievements , he assigned the young Jedi Knight to stay on the Koros system to help Empress Teta restore order to the new alliance of planets . Visions . While Odan - Urr was staying on Koros , Ooroo had a vision of the ancient Sith Empire , and the war it would bring to the Republic . In the vision , Ooroo witnessed the funeral of the Dark Lord of the Sith Marka Ragnos . During the funeral , the two rivals for Ragnos ' s throne , Naga Sadow and Ludo Kressh , engaged in a frenzied duel . Sadow wanted to invade the Republic and expand the borders of the Sith Empire , while Kressh was content to continue to keep their existence a secret from the Jedi Order and the Republic . As the duel neared a close , the spirit of Marka Ragnos emerged , and told the two Sith that the Sith Empire was under threat , and to choose their paths wisely . Odan - Urr had the same vision on Koros . Ooroo interpreted the dream the same way as his apprentice : that , although they may be long forgotten , the Dark Jedi that were banished over a thousand years previously still posed a great threat to the Republic . Odan - Urr later went with Teta and Nadill to Coruscant , where Teta told the Senate of the dangers that lay ahead . However , the senators were highly skeptical of Teta ' s speech , refusing to prepare for war because of the dreams of a young Jedi . The trio left , dejected , though Teta pledged her full military support . However , a group of Jedi Knights , whom Ooroo later contacted , took Teta ' s pleas seriously . Several days later , Ooroo traveled to Koros to check on the progress of his young student . He met Empress Teta in her palace , and she told him of Odan - Urr ' s visions , before sending her advisor Memit Nadill to bring Odan - Urr to them . Odan - Urr arrived shortly after , surprised and delighted to see his master . The young Draethos told his master that he missed the tranquility of Ooroo ' s training facility . Ooroo replied that Jedi must , at times , learn action as well as knowledge . The Celegian Jedi Master then told the others that he too had been having dreams , and that their pleas in the Senate did not go unheard ; three Jedi Knights believed what Teta had said to be true . Ooroo then told Odan - Urr , Nadill and Teta that if the Republic should confront the fabled Sith Empire , it would devastate and destroy what had stood for twenty thousand years before , and cross the fabric of hyperspace . Afterwards , Teta led the three alien Jedi out onto a great balcony , overlooking a massive courtyard , where the Empress ' s impressive forces prepared . She told them that now that she had brought peace to her home system , she would not let it fall to an outside enemy . Ooroo decided to stay with his apprentice on Koros , though he was absent when a young woman burst into Teta ' s chambers . Jori Daragon and her brother Gav had entered random hyperspace coordinates into their ship , the " Starbreaker 12 " , and had landed on Korriban , the mausoleum planet of the Sith . The two siblings were taken in and cared for by Naga Sadow , one of the aspiring Dark Lords , and Gav was even briefly trained in the ways of the Sith . However , during a skirmish between the forces of the two competing Sith Lords , Jori was forced to leave her brother on the desert planet and flee back to the Republic . Sadow had planned this , though , and had placed a tracking signal on Jori ' s ship . The young Human female told them that Sadow was preparing to launch an invasion on the Republic . The Jedi knew this was the evidence that would persuade the Senate of the danger they were in , so Memit Nadill traveled to Coruscant to meet with members of the Jedi Order . Ooroo and Odan - Urr chose to wait on Koros , where Teta prepared her forces for a full - scale invasion . Battle of Kirrek . Nadill eventually arrived on Coruscant and met with the Jedi Knights , but he was too late ; Sadow ' s men , aided by his Sith magic illusory soldiers , attacked the capital with hundreds of warships . Meanwhile , Ooroo and Odan - Urr were stationed on local Kirrek , where they commanded Teta ' s forces . The pirates and rebels Odan - Urr had helped to defeat previously were supporting Teta ' s army in an attempt to gain amnesty for their actions during the Unification Wars . Odan - Urr was hesitant at having to face real combat , though Ooroo was able to calm him . Ooroo told his young apprentice that he himself would fight against the Sith , even though he was in his tank . The immense Koros army created a barricade around a huge citadel on Kirrek as thousands of Sith pods , each containing hundreds of warriors , were sent down onto the barren wasteland . Masses of Massassi warriors , Sith war behemoth s and Sith war worm s charged at Teta ' s forces , tasked with tearing down the citadel ; the battle of Kirrek had begun . The battle raged on , with the Republic forces taking heavy damages . Odan - Urr had tried to use his battle meditation , to no avail ; it did not seem possible to sway the purposes of the single - minded fury of the Massassi , who were routing Teta ' s men . The young Draethos asked Ooroo how would they fight such an enemy , and the ancient Jedi Master replied that they would fight them with the Force , to the best of their abilities . Using great wooden ladders to climb the massive wall of the Citadel , the group of Massassi broke through the defensive barricade . A young soldier of Teta ' s called out to Odan - Urr , who was standing still , upset at the suffering taking place around him . Odan - Urr told his master that there was no chance for victory , and that his dream had come true . Ooroo had foreseen these events , and had a plan prepared . As the hordes of Massassi approached Ooroo and his understudy , the old Celegian master ordered the Republic troops to retreat . Odan - Urr protested , but after stern words from his master , the Jedi Knight fell back with the soldiers . The Massassi warriors saw their enemies withdrawing , and closed in on Ooroo . The ancient Jedi Master then punctured his cyanogen - filled chamber with one of his pink tentacles , releasing the deadly gas into the atmosphere . The cyanogen poisoned and killed all of the vicious Massassi . Meanwhile , oxygen poured into Ooroo ' s smashed tank , slowly killing the Jedi Consular . However , even though their most powerful units had been defeated , the Sith forces continued to attack . Suddenly , dozens of giant ships appeared in the atmosphere . Although Teta ' s men originally thought it was another wave of Sith , they turned out to be bearing the symbol of Empress Teta ; thousands of prisoners from Ronika , the prison planet of the Koros system , had been released to fight for Empress Teta . The Sith were already taking heavy losses , and this fresh batch of enemies made them retreat back to their Empire . Ooroo had still not passed away , though he was unable to move , and the oxygen was taking its toll on him . His mouth covered with part of his robes , Odan - Urr approached his master , suffering great grief . Odan - Urr told the Celegian that he wished the two could have stayed in the peaceful libraries of the training planet together , surrounded by books . Ooroo replied that he would have loved to float in the seas of his homeworld one last time . Ooroo then reassured him that he would grow old and one day die among his precious books and scrolls , and live to be one of the most ancient Jedi ever . Ooroo then passed away , and became one with the Force . Legacy . Odan - Urr helped defeat the remaining Sith forces on Kirrek , and Memit Nadill , aided by the three Jedi who had been present at the senate hall , defeated the Sith on Coruscant . Although there were great losses and damages , the war , later known as the Great Hyperspace War , had ended in victory for the Republic . Odan - Urr was glad that the Republic emerged victorious , but was extremely distressed by the loss of his master , who he would never forget . The former pirates and rebels who had fought alongside Ooroo and Odan - Urr were granted amnesty for their brave efforts in defeating the Sith . Empress Teta stayed on as the Empress , living for over one hundred and seventy - five years . Ooroo ' s prophecy about Odan - Urr would become true : Odan - Urr went on to become a Jedi Master and would die over a thousand years later among his books in a Great Jedi Library on Ossus , which he had founded himself . Ooroo was later given the title of the Martyr of Kirrek for his actions on the barren planet . As the Jedi Order solidified itself following the defeat of the Sith , the Coruscant Jedi Temple began to take shape as the headquarters of the Order . Along the Processional Way , a giant bronzium statue of Ooroo was erected alongside the likenesses of fellow Masters Arca Jeth and Odan - Urr . Personality and traits . Ooroo was a selfless individual , and put the needs of others before his own . During the Battle of Kirrek , he punctured his life - support chamber , sacrificing his own life so that his apprentice would survive and the deadly Massassi warriors would be defeated . He had foreseen what was going to happen , and had deduced that the only way to defeat the Massassi was to release his cyanogen , which would kill him . As he lay dying , Ooroo ' s only regret was that , since becoming a Jedi , he had not visited the great seas of his homeworld . He used to swim there , without the cumbersome life - support chamber necessary on planets other than Celegia . Ooroo was also extremely encouraging to Odan - Urr . The young Jedi would have been content to stay in Ooroo ' s Jedi Praxeum for his entire life , reading books and studying ancient scrolls and documents , but for Ooroo ' s urging . The old Celegian wanted Odan - Urr , who he knew had massive potential as a Jedi Knight , to leave the library occasionally . He encouraged him to go on assignments offworld , where he was more likely to see combat and gain a better picture of what it was like to be a Jedi Knight . Ooroo was an old and wise Jedi Master and Jedi Instructor , with great knowledge of Jedi lore . He knew what would happen at Kirrek , and he knew what had to be done if the Republic were to be victorious . He was also correct , as was his Draethos Padawan , in his interpretations of the vivid dreams of Marka Ragnos ' s funeral , and the damage the Sith would inflict upon the Republic . A diplomatic Jedi , Ooroo was able to easily sense the motive of someone he was conversing with . Powers and abilities . Ooroo preferred to avoid combat where possible , though he knew that part of a Jedi ' s duty was to enforce peace , which often involved fighting . However , his cumbersome life - support tank meant that he could not fight as freely as he would have been able to on his homeworld , free of his cyanogen tank . Although he did not carry one in his later years , Ooroo was entirely capable of using a lightsaber . He was also adept at using as weapons not widely used by Jedi , such as blaster pistols and primitive weapons . Ooroo practiced the ancient and little known Jedi art of battle meditation , which affected the morale of both allies and enemies and allowed the user to envision an outcome they desired . Battle meditation simultaneously lowered the morale and spirit of enemy soldiers and heightened the morale of the user ' s forces , which gave victory to one side and lowered the death count of battle . However , the one drawback of this was that broken - spirited hostiles could become desperate , and , rather than surrender , attempt to take down as many of the other side as possible . Boosting morale was not the only advantage of the power , however . The user could imagine things in their mind , which , if the power was utilized properly , would become a reality . This meant that a Jedi skilled in battle meditation could almost choose the outcome of the battle that suited them . Ooroo was also a master of Force sense , which granted the user the ability to extend his senses through the Force and gain a great awareness of his surroundings . Other powers known to be used by Ooroo were Force alter and control ; he also had the ability to heal himself and others , and could telekinetically move objects with the Force . Ooroo ' s species , known as Celegians , did not have a spoken language ; they communicated with each other telepathically , and they could use their telepathy to talk to other sentients up to five hundred meters away . This ability could only be used for communication ; Celegians could not access others ' memories or thoughts . In addition to his natural telepathy , Ooroo could speak Galactic Basic Standard . Because Celegians were extremely rare in the Jedi Order and off their homeworld generally , and because most species could not respond to a Celegian ' s telepathic messages , Ooroo generally spoke Basic . Behind the scenes . Ooroo was created by " Star Wars " author Kevin J . Anderson for the sub - series " " , which is part of the " " comic series . He appeared again in the subsequent story arc " " , which was also written by Anderson . He was drawn by Dario Carrasco , Jr . in both story arcs , with three other artists acting as inkers . His backstory was later expanded upon in the " Power of the Jedi Sourcebook " , written by several authors , with additional art by Jeff Carlisle .