Bombardment of the Uba system During the New Sith Wars , the Galactic Republic launched a preemptive strike against the Uba system , the home star system of the Ubese species , to show the proud Ubese that the banned weapons they were constructing were inferior to the Republic ' s own . However , the orbital bombardment of the planets Uba I , Uba II , Uba IV , and Uba V accidentally ignited superweapon caches , ravaging the planets ' surfaces with radioactive firestorms . The only survivors were found on Uba IV , some of whom were relocated to the Ubertica system . The event led to a deep - seated hatred of the Republic among the Ubese . History and the purge . For centuries prior , the Ubese had begun manufacturing weaponry in a bid to become more competitive , and to spread their influence throughout the galaxy . However , among these were weapons banned since the foundation of the Republic . Upon further investigation by local sector observers , the combined worlds launched a preemptive strike in the form of a tactical planetary bombardment of the Ubese weapons manufacturing plants . Unfortunately for the Ubese , the bombardment set off the largest share of their tactical weapons of mass destruction , utterly destroying three out of the four inhabited worlds in the system ( Uba I , II , and V ) , with the only survivors found on Uba IV . Ashamed of their actions , the Old Republic covered up the entire affair . The Republic sector authorities refused all relief aid in the aftermath , even going so far as to wipe the very coordinates of the Uba system off the galactic navcharts , and decades later , the average galactic citizen had never even heard of the Ubese near - extinction . Some of the Ubese , however , did escape , and managed to secrete themselves away on various worlds , blaming the Republic for turning their world into a radioactive ball and the Jedi for not acting in time to save them . These Ubese refugees managed to find employment with various crime lords and other shadowy figures , forging themselves into weapons : well - trained , highly disciplined , and utterly unstoppable in their hatred of the Republic and the Jedi . Behind the scenes . The timeframe of the Battle of Uba IV presented in " The New Essential Chronology " conflicts with the previous official account given in the game " " — in the game ' s storyline , a number of the Ubese survivors from the battle had taken up employment with the Quarren Exchange crime lord Visquis on Nar Shaddaa , acting as personal grenadiers within his private sanctuary . The game describes their clan despising the Jedi for not interceding in the Republic bombing of their planet . The information presented in " The New Essential Chronology " does , however , more closely mesh with the account given in the role - playing game supplement " Alien Encounters " . Dan Wallace explains the discrepancy as follows : " It ' s been pointed out that the NEC places the destruction of the Ubese homeworld ( forcing the Ubese to wear breath masks like Leia in ) at approx . 2000 - 1500 BBY - - however , the game " Knights of the Old Republic 2 : The Sith Lords " , set in 3951 BBY , features breathmasked Ubese . It ' s a discrepancy for now . ( For the record , I placed the event where I did to correspond with WEG ' s " Alien Anthology " , and was unaware of KOTOR2 ' s Ubese at the time . ) " In " The Essential Atlas " the event is finally dated as happening in 1800 BBY .