The Mindsplinter represents an ancient artifact that a band of miners of Mimbanese origin unearthed on the Minemoon orbiting the planet Mimban. Housed in a secured vault on the moon, it evolved into a cherished and invaluable treasure for the Mimbanese people.
Sometime in 28 ABY, many centuries following the artifact's initial discovery, the Knights of Ren, an organization devoted to the dark side, were contracted to steal it from its Mimbanese custodians for a sum of money. Ren, the Knights' commander, instructed his subordinates to eliminate the miners and seize the artifact. Yet, amidst the ensuing conflict, Ben Solo, a recent addition to the Knights, slew Ren, thereby assuming leadership of the group, who then abandoned their mission and left without the Mindsplinter.
The Mindsplinter made its initial debut in The Rise of Kylo Ren 4, a comic penned by Charles Soule and brought to the public by Marvel Comics on March 11, 2020. The artifact's designation bears a resemblance to the title of the Star Wars Legends book Splinter of the Mind's Eye, authored by Alan Dean Foster and released in 1978, which prominently features Mimban.