If you're a fan of Star Wars, then chances are that you know all about Luke Skywalker's green lightsaber. This iconic weapon first appeared in the film Return of the Jedi and has since become a symbol of the Jedi Order. After losing his father's blue-bladed lightsaber and hand during the fight on Jabba's sail barge, Luke built himself a new blade that would signify his full mastery of the Force. It was a brilliant choice.
However, for whatever reason George Lucas and his crew decided that the second lightsaber that Luke constructed should be green instead of blue. This is not without its ramifications, as making the blade green opened the door for more lightsaber colors. Typically, Jedi choose blue lightsabers to represent their zeal for justice and action. Green blades, on the other hand, signify serenity and balance.
Despite the fact that it was one of the most important weapons in the entire Star Wars franchise, the green lightsaber was almost completely ignored in the sequel trilogy. It only appears twice: in a series of flashbacks in The Last Jedi and in Star Wars Episode IX: The Rise of Skywalker.
In both instances, the saber is possessed by the caretakers of Ahch-To and presumably has been in their possession since Luke's sacrifice and subsequent turn to the dark side. This is likely how Rey obtained the blade, which she later used to defeat Kylo Ren in a battle that was ultimately the downfall of the Resistance and the end of the war against the First Order.