The Star Wars canon has emphasized the power and importance of the Darksaber in The Mandalorian, but future properties may reintroduce an even more powerful weapon: the Dagger of Mortis. This mystical weapon holds symbolic significance like the Darksaber; but whereas the Mandalorian weapon is functionally almost the same as any other lightsaber, the Mortis Dagger is capable of far more. The Dagger may appear in several upcoming Disney+ Star Wars shows, potentially being a significant plot element that brings The Mandalorian, Star Wars: Ahsoka, and Star Wars: Rangers of the New Republic together in a crossover event. But what is the Dagger of Mortis and what can it do?
The Dagger of Mortis first appeared in Star Wars: The Clone Wars, where it was fought over by the three Star Wars Force-users who were found in the mysterious Wild Space realm known as Mortis. These beings, named The Father, The Daughter, and The Son all used the Force with near-omnipotent power, so naturally, the abilities and weapons of Jedi and Sith paled in comparison to those of Mortis. The Force wielders were nearly immortal as well, but the Mortis Dagger was one of the few things that could kill them. The Dagger was used directly to kill The Daughter and The Father, and indirectly to kill The Son (whose immortality was removed upon the death of The Father).
The Darksaber may have the most unique lightsaber blade color and origin, but it is ultimately just another lightsaber in terms of functionality, though it does increase a wielder's aggression and tugs at their dark side instincts. Still, the weapon’s true power comes from its historical and cultural significance to Mandalorians. One must defeat the Darksaber’s owner in combat to have a rightful claim to it, and the wielder of the weapon is also considered the true ruler of Mandalore (at least by the time of 9 ABY). By being able to kill a god-like Force-wielder, the Mortis Dagger far outclasses any lightsaber, including the Darksaber. Considering the connections between Ahsoka Tano, the Mortis Force-wielders, and the World Between Worlds, the Dagger could easily make its reappearance in Star Wars: Ahsoka.
Of the three Jedi visitors to Mortis, Ahsoka Tano is the only one still alive in 9 ABY. The Dagger could be pursued by both Ahsoka and Grand Admiral Thrawn (who Tano was tracking down in her episode of The Mandalorian). The Dagger was left on Mortis when Ahsoka, Anakin, and Obi-Wan left the realm, but how they ended up there (and how they left) isn’t made explicitly clear in The Clone Wars, so a non-Force user like Thrawn may attempt to access the Dagger through more crude methods, as Veris Hydan did to the entrance to the Worlds Between Worlds in Star Wars Rebels.
The Mortis Dagger could also be tied to the mystical World Between Worlds, given their shared connections to the Force wielders of Mortis. Perhaps the Mortis Dagger can be used for more than killing Force wielders and is a method of entering the mysterious plane. The World Between Worlds gives visitors access to any point in time and space, which would easily make it important enough to involve Din Djarin and Cara Dune (as well as Luke Skywalker and Grogu) in Ahsoka’s adventures. Though unlikely, the plane (and by extension, the Dagger) could be the catalyst for a crossover between the Star Wars Canon and Legends universes.
