In the aftermath of the Battle of Exegol, the remnants of the First Order and Sith Eternal begin the construction of two conjoined Star Destroyers that house a large superlaser capable of destroying planets. Using Sith alchemy, they are also able to create two Force-sensitive biological twins named Karre and Am, who they then train in the dark side of the Force. The twins eventually become the leaders of the remnant and plan to use their superweapon to destroy the New Republic. However, Karre goes rogue on the day the weapon is supposed to be fired due to him having a vision of the future involving his sister's death; he also steals the large kyber crystal that powers the superweapon. Am confronts Karre outside of the Star Destroyers in outer space and they duel. During the battle, the crystal is split in half and Am uses a piece to power a metal exoskeleton. Using his X-wing and the power of hyperspace, Karre is able to destroy Am's sliver of the crystal and the superlaser; he crash-lands on Tatooine and vows to rescue his sister from the dark side.