Wall of light A wall of light was an immense manifestation of potentially destructive light side Force energy created by the focused power of a united Jedi front . When performed successfully , a wall of light allowed participants to effectively contain or purge the power of the dark side from a specific location , or sever an especially dangerous darksider from their Force connection . The ability was popular among Great Sith War – era members of the Jedi Order , who used it to great effect against the resurgent Dark Lords of Exar Kun ' s Sith Brotherhood , and later against the spirit of Kun , by the inaugural class of Luke Skywalker ' s Jedi Praxeum . Description . The use of the Force to create a wall of light side energy was a Jedi ' s most devastating offensive ability . The technique required the collective effort of several participants to form — with considerable difficulty — an all - encompassing prison of blue energy , from which the dark side could not escape . Celestial bodies besieged by a wall of light were sterilized utterly with flames and violent weather phenomena , while wielders of the dark side found themselves completely blocked from the Force . Applications . The primary purpose for the creation of a wall of light around a specific location was the quarantine or total eradication of the dark side ' s malevolent influence . Jedi Knights also used walls of light to harmlessly subdue or repel extremely dangerous enemies . Under dire circumstances , however , a lone Jedi was able to channel the light side of the Force to offensively incapacitate a foe , but use of such power often brought forth unexpected and potentially catastrophic results . The victim of a wall of light experienced extreme agony as their connection to the Force was interrupted in a severance that could be made permanent at the discretion of the Jedi . Walls of light were also an effective weapon against Sith spirits . Users . Draethos Jedi Knight Odan - Urr used a wall of light to disconnect Sith Lord Naga Sadow ' s defeated Sith warriors from the Force in the final stages of the Great Hyperspace War . He later recorded a detailed account of the ability in the Tedryn Holocron . More than a thousand years after the Hyperspace War , Odan - Urr taught a prodigious Jedi Knight named Nomi Sunrider to utilize walls of light in the harmless incapacitation of enemies . During the Jedi conclave on Deneba , Arkanian Jedi Master Arca Jeth inferred that a wall of light was required to drive away the Krath cult , whose holy crusade against the Republic had spread the influence of the dark side across the galaxy . When the Krath later attacked the planet Coruscant , their leader , fallen Jedi – turned – Sith Lord Ulic Qel - Droma , was defeated and trapped within a wall of light by Masters Vodo - Siosk Baas and Thon , who were assisted by Knights Tott Doneeta , Cay Qel - Droma , Nomi Sunrider , Dace Diath , and Sylvar . Nomi Sunrider faced Qel - Droma again on Ossus and imprisoned him within a wall of light that inadvertently resulted in Qel - Droma ' s permanent severance from the Force . At the culmination of the Great Sith War , Sunrider guided thousands of Jedi , including Tott Doneeta , Sylvar , Oss Wilum , and Thon , in the creation of a wall of light over the Yavin moon to defeat Dark Lord of the Sith Exar Kun . Although his spirit had been successfully trapped within the walls of his Massassi temple , a planet - wide firestorm caused by the Jedi ' s magnified power annihilated Yavin 4 ' s landscape in the process . More than four thousand years later , Kun ' s ghost was forever cleansed from Yavin 4 through the creation of a wall of light initiated by the trainees of Master Luke Skywalker ' s Jedi Praxeum . Behind the scenes . Wall of light was a Force power first mentioned in Tom Veitch and Kevin J . Anderson ' s " " , the third issue in the " " comic book story arc . It was also mentioned in John Whitman ' s " " audio rendition . Wall of light ' s first appearance was in " " , the second issue of subsequent " " story arc . It was also featured as the means by which the Jedi and Republic defeated Exar Kun in " The Sith War " final issue , titled " " , and the instrument of Kun ' s defeat yet again in the third novel in the " " , " Champions of the Force " . Wall of light received its own card with the September 2009 release of " The Shadow Syndicate " , the fourth expansion set of the " Star Wars Galaxies Trading Card Game " . A similar illustration was later implemented in " " , the tenth in a series of in - universe holorecordings made by Kel Dor Jedi archivist Gnost - Dural . While " The Sith War 6 : Dark Lord " depicts the destruction of Yavin 4 ' s landscape as the result of the Jedi ' s creation of a wall of light , " The Essential Atlas " states incorrectly on pages 112 and 131 that the moon ' s surface was destroyed by orbital bombardment . In the BioWare MMORPG " " , one of the servers is named after this Force technique .