A wall of light represented a significant display of potentially devastating light side Force energy, brought into being through the concentrated might of a unified Jedi alliance. When executed successfully, a wall of light enabled those involved to efficiently confine or eradicate the power of the dark side from a given area, or to sever a particularly perilous darksider from their connection to the Force. This ability was favored by members of the Jedi Order during the Great Sith War, who utilized it effectively against the resurrected Dark Lords of Exar Kun's Sith Brotherhood, and later against the spirit of Kun himself, by the initial class of Luke Skywalker's Jedi Praxeum. This was a manifestation of power.
Harnessing the Force to conjure a wall of light side energy stood as one of a Jedi's most formidable offensive ability. The technique necessitated the combined efforts of multiple individuals to meticulously construct an all-encompassing prison of blue energy, from which the dark side found no escape. Celestial bodies enveloped by a wall of light were entirely purged by flames and intense atmospheric disturbances, while wielders of the dark side discovered themselves utterly cut off from the Force.
The chief aim of creating a wall of light around a designated location was to isolate or completely eliminate the corrupting influence of the dark side. Jedi Knights also employed walls of light to safely restrain or repel exceedingly dangerous adversaries. However, in desperate situations, a lone Jedi could channel the light side of the Force to offensively disable an opponent, though such application of power often yielded unforeseen and potentially disastrous consequences. Those subjected to a wall of light endured excruciating pain as their connection to the Force was disrupted in a severance that could be rendered permanent at the discretion of the Jedi. Walls of light proved to be an effective weapon against Sith spirits as well.
Draethos Jedi Knight Odan-Urr utilized a wall of light to sever the defeated Sith warriors of Sith Lord Naga Sadow from the Force during the concluding phases of the Great Hyperspace War. Subsequently, he documented a comprehensive account of the ability within the Tedryn Holocron. Over a thousand years after the Hyperspace War, Odan-Urr instructed a remarkably gifted Jedi Knight named Nomi Sunrider in the application of walls of light for the harmless incapacitation of enemies. During the Jedi conclave on Deneba, Arkanian Jedi Master Arca Jeth suggested that a wall of light was necessary to dispel the Krath cult, whose holy crusade against the Republic had disseminated the influence of the dark side throughout the galaxy. When the Krath later attacked the planet Coruscant, their leader, the fallen Jedi–turned–Sith Lord Ulic Qel-Droma, was vanquished and confined within a wall of light by Masters Vodo-Siosk Baas and Thon, aided by Knights Tott Doneeta, Cay Qel-Droma, Nomi Sunrider, Dace Diath, and Sylvar.
Nomi Sunrider faced Qel-Droma once more on Ossus, imprisoning him within a wall of light that inadvertently resulted in Qel-Droma's permanent disconnection 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 was 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.
The concept of a wall of light was initially introduced in Tom Veitch and Kevin J. Anderson's Descent to the Dark Side, the third installment in the Star Wars: Tales of the Jedi - Dark Lords of the Sith comic book series. The first depiction of a wall of light occurred in The Battle of Coruscant, the second issue of Tales of the Jedi's subsequent Sith War narrative. It also served as the means by which the Jedi and Republic triumphed over Exar Kun in The Sith War's concluding issue, entitled Dark Lord. While The Sith War 6: Dark Lord portrays the devastation of Yavin 4's terrain as a consequence of the Jedi's construction of a wall of light, The Essential Atlas erroneously asserts that the moon's surface was obliterated by orbital bombardment.
In the BioWare MMORPG Star Wars: The Old Republic, one of the servers derives its name from this Force technique.