The Darksaber was an ancient, black-bladed Lightsaber. According to legend, it was created by Tarre Vizsla, the first Mandalorian ever inducted into the Jedi Order. Following his passing, the weapon was kept in the Jedi Temple until members of House Vizsla stole it during the Fall of the Old Republic. The Darksaber became a symbol of leadership on Mandalore, and was passed down, generation to generation, by the ancestors of Pre Vizsla until it was taken by Maul, former Sith apprentice of Darth Sidious, and with it, leadership of Death Watch.
After the Clone Wars, Maul added the Darksaber to a collection of artifacts he maintained on Dathomir, and it was then taken up by Sabine Wren after she was possessed by the ghost of one of the Nightsisters. After being freed, Sabine recovered the Darksaber for her own use, and would eventually be instructed in its use in hopes that she could use it to unite the people of Mandalore.