Star Wars: The Rise of Skywalker very suddenly introduced the idea of Sith Wayfinders and a dagger which led Rey to the one belonging to Emperor Palpatine. That was hidden in the remains of the Death Star II, and if it all felt a tad convenient...well, we can't really argue with you!
Regardless, the dagger did look pretty cool, and concept artist Matthew Savage has now shared his final designs. He explains that its creation was a "collaborative process between myself, the prop master, the prop makers, the graphics team and VFXs," and goes into detail below about how its design needed to match the remains of Palpatine's destroyed weapon.
We didn't see much more of the dagger after that scene on Kef Bir, so chances are it won't be an important part of Star Wars lore moving forward (after all, it has now served its purpose).
However, we will more than likely get to see its origins explored in a future comic book or novel!
Check out the concept art in the Instagram post below: