Kai's lightsaber, also referred to as Kai's first lightsaber, is a lightsaber that Kai Brightstar, a Jedi Initiate, utilized during the High Republic Era.
In the year 232 BBY, Jedi Master Yoda dispatched Brightstar on a mission; during this mission, the pirate Taborr Val Dorn stole his lightsaber. Subsequently, Kai obtained a replacement lightsaber, a gift from Yoda.
The initial appearance of Kai's lightsaber occurred in Young Jedi Adventures: Jedi Training, a children's book authored by Caitlin Kennedy and released on May 2, 2023. Its first mention was within a StarWars.com article titled "Begin Your Younglings' Training with Star Wars: Young Jedi Adventures Books – First Look," and it was initially depicted in another article, "Star Wars: Young Jedi Adventures Release Date and Cast Revealed," as well as in an episode of This Week! in Star Wars. Both the aforementioned articles and the This Week! episode were published on February 9, 2023. It was later identified as "Brightstar's saber" in the article "Meet the Young Jedi: Stars Jamaal Avery Jr. and Juliet Donenfeld on Making Star Wars: Young Jedi Adventures," which was released on May 19, 2023.