Despite being broken in half during the events of Star Wars Episode VIII: The Last Jedi, Luke’s old Lightsaber had been fixed by the beginning of The Rise of Skywalker. Here’s how.
The crystals have a special connection to the force, and when younglings reach a certain point in their training, are sent to the planet of Ilum where they select a crystal for themselves to create a lightsaber, or rather, the crystal chooses them.
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As the primary power source for a lightsaber, a whole and unbroken crystal is needed to power a lightsaber, and when one is broken, the lightsaber is no longer functional without a new one, however, it has been now revealed there is a way to make a lightsaber whole.
In The Last Jedi, during Rey and Kylo Ren’s confrontation in Snoke’s throne room, Luke’s original lightsaber was split in half, and as shown later on in the movie, the crystal had been divided too, but in The Rise of Skywalker, which takes place one year after the previous movie, Rey is shown to have rebuilt it.
Instead of just lazily saying Rey got another crystal and used the same hilt in the time between movies, an explanation for how it was fixed is revealed in the Star Wars: The Rise of Skywalker Visual Dictionary.
In the Visual Dictionary, it is explicitly said that “the Kyber crystal inside (the lightsaber) was healed using techniques gleaned from the Jedi scripture”.
As we know from The Rise of Skywalker, Rey has learned a few new abilities from the original Jedi scriptures she took from Luke on Ahch-To, such as ‘Force Heal”, and the ability to restore a crystal must be among the other powers she has learned as well.
So for those questioning how the Lightsaber was restored, this is the official explanation. While the technique used has not been explicitly revealed, at there very least, this is better than just ignoring that the lightsaber was ever broken.
Star Wars: The Rise of Skywalkers is currently still playing in theaters.