Warning: contains spoilers for Star Wars: Obi-Wan #2!
The Sith are the historic enemies of the Jedi, yet when Obi-Wan and Qui-Gon's lightsabers malfunctioned, it confirmed how thoroughly the Dark Side cult had faded from memory, allowing for their devastating return under the aegis of Darth Sidious.
Generations ago, there were many Sith and many Jedi that engaged in huge battles and all out-war. Over time, the Sith's lust for power caused them to have inner struggles and sabotage their own goals. This led to Darth Bane creating the rule of two, which stated that there can only be two Sith, a master and an apprentice, operating at any given time. But this severely limited their numbers, which led the Jedi to believe that they had become extinct.
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In Star Wars: Obi-Wan Kenobi #2 by Christopher Cantwell and Luke Ross, Obi-Wan and his master Qui-Gon investigate a mining incident on a strange planet. A group of thieves have caused radioactivity to spike in the mine, which affects the brightness of Obi-Wan and Qui-Gon's lightsabers. Before they figure this out though, the two Jedi speculate what is causing their lightsabers to dim. Obi-Wan theorizes that perhaps the presence of a Sith might be causing the lightsaber troubles. Qui-Gon dismisses the idea, stating that the Sith are extinct.
Obviously, Star Wars fans now understand that a Sith's presence has no effect on a Jedi's lightsaber. But back then, Qui-Gon and Obi-Wan had never encountered a Sith before. In fact, no Jedi had encountered a Sith for generations. So their experience and knowledge of the Dark Side of the Force was extremely limited and lacking. It was so lacking in fact that Obi-Wan
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