A portion of the Death Star ruins were located in the oceans of the moon Kef Bir in the Endor system. After the second Death Star was destroyed in 4 ABY during the Battle of Endor, portions of the superweapon, including the Emperor's Throne Room where he kept his wayfinder, fell onto Kef Bir.
In 35 ABY, the Jedi Rey and her Resistance comrades journeyed to the moon in search of a wayfinder that led to resurrected Darth Sidious's redoubt on the planet Exegol deep inside the Unknown Regions. There, she faced the dark warrior and Supreme Leader of the First Order Kylo Ren in their final duel, which resulted in him turning back to the light side of the Force.
Two TIE fighters rests in the wreckage of one of the hangars.
After the superweapon's destruction during the Battle of Endor in 4 ABY, parts of the second Death Star fell onto Kef Bir, including parts of the northern pole and the southern edge of the battle station's superlaser lens concavity. The remains of the Emperor's Throne Room were also part of the wreckage, including a vault in the Throne Room where Darth Sidious kept his Jedi and Sith artifacts. Over the years, the structure of the Death Star ruins was eroded and waterlogged by the ocean, becoming deeply unstable.
When the survivors of Company 77—a company of stormtroopers who defected from the First Order—settled on Kef Bir, they salvaged Imperial technology to create the equipment that helped them survive on the moon's harsh environment.
The remnants of the Imperial Throne Room
After a successful attack on the Death Star II's reactor during the battle of Endor, the ruins of the destroyed battle station subsequently fell to the surface of the ocean moon Kef Bir. The Alliance Fleet had also set up tractor beams and shields to protect the forest moon from debris.
Rey faced a Force vision of a dark side phantasm identified as "Dark Rey" in the Death Star ruins.
In 35 ABY, the Jedi Rey came to Kef Bir and the ruins there during her quest to find the Emperor's wayfinder that could lead her to the resurrected Darth Sidious's stronghold on the Unknown Regions planet of Exegol. Rey was faced by a phantasm of the dark side of the Force in the form of a Force vision of herself; the vision of the so-called "Dark Rey" within the Emperor's old throne room showed Rey a future version of herself who had embraced the dark side. All the same, Rey successfully located the wayfinder. Before she could take it and return to her companions, however, her adversary Kylo Ren destroyed it.
The pair dueled atop the ruins. Ren became distracted, sensing the death of his mother, Leia Organa, allowing Rey to gain the advantage and stab him. Rey subsequently healed him and took his TIE/wi modified interceptor, leaving him stranded aboard the Death Star II's wreckage. Ren then spoke to a memory of his father, Han Solo, and subsequently renounced the dark side, throwing his weapon into the surrounding ocean and reclaiming his former identity of Ben Solo. In order to escape the moon and accompany Rey during her confrontation with Darth Sidious, Solo procured a TIE scout starfighter that had survived the Death Star's destruction, and piloted it out of the ruins and off of Kef Bir.
The Death Star ruins first appeared in the 2019 film Star Wars: Episode IX The Rise of Skywalker, the third and final installment of the Star Wars sequel trilogy.
The 2019 novel Force Collector by Kevin Shinick, which was part of the Journey to Star Wars: The Rise of Skywalker publishing line, originally featured the protagonist Karr Nuq Sin visiting the remains of the Death Star, just as Rey did in Episode IX. According to Shinick, he inadvertently wrote this similar journey into the first draft of the novel and was informed that aspect needed to be changed to avoid treading the same ground as The Rise of Skywalker about a year prior to the book's publication and film's premiere.
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