Seventh Battle of Ruusan The Seventh Battle of Ruusan was the final major engagement of the conflict known as the New Sith Wars . There were actually seven prior battles on the world during the last days of the war , but the pivotal and last battle is the one most remembered , due to the use of the thought bomb ; it is usually referred to just as " the " Battle of Ruusan . This was also the event that would lead to the Ruusan Reformation of the Galactic Republic . Prelude . The New Sith Wars began 2 , 000 years before the Battle of Yavin and ended after a thousand years of conflict , including internal Sith conflict , and all - out assaults on the Galactic Republic . At one stage during the long war , the Sith had been in control of most of the galaxy , but the Army of Light slowly regained the Republic ' s lost territory with decades of hard - fought campaigns . Eventually , the Sith retreated to Ruusan , where , after six months of battle with the Jedi in six separate battles , the Sith were near defeat . The Jedi Lord Valenthyne Farfalla crushed the Sith in the pivotal seventh battle of Ruusan , and Lord Hoth journeyed to apprehend the leaders of the Brotherhood of Darkness . The Sith , however , were waiting for them and had one final weapon . Showdown . In an act of desperation , Lord Kaan , leader of the Sith , unleashed the thought bomb and in an instant , every Force - sensitive in the blast radius was destroyed . Lord Farfalla had retreated with the majority of the Army of Light in accordance with Lord Hoth ' s final orders . The only surviving Sith was Darth Bane , who , while leaving the battlefield , came across the young girl Zannah . Legacy . The conclusion of the final confrontation on Ruusan led to the apparent extinction of the Sith , and the restructuring of the Republic and of the Jedi Order . Afterwards , the Jedi Johun Othone built a monument at the battlefield to commemorate the fallen Jedi of the war . It became known as the Valley of the Jedi , and was a powerful Force nexus . For over a thousand years the spirits of Hoth , of Kaan , and of countless other Jedi and Sith would remain trapped in the Valley , until they would be freed by mercenary - turned - Jedi Kyle Katarn in 5 ABY . The outcome of the war also resulted in the last surviving Dark Lord of the Sith , Darth Bane , deciding henceforth to concentrate the dark side of the Force in only one master and one apprentice thereby restructuring the Sith Order . This decision allowed the Sith to hide within the Republic until their existence was finally revealed with the rise of Emperor Palpatine , whose apprentices included Darth Maul , Darth Tyranus , and finally Darth Vader . The return of Anakin Skywalker , once Darth Vader , to the light , and the demise of the Emperor , who was the last true master of Darth Bane ' s reformed Sith Order , brought to fruition the prophecy of the Chosen One who would bring " balance to the Force " . Behind the scenes . In the fifth part of the blog series " " , when covering the cut section of a different take on the Battle of Ruusan , author Paul Urquhart stated that the battle ' s real life equivalents were the during the and the during the .