Darksaber/Legends

"This lightsaber was stolen from your Jedi Temple by my ancestors during the fall of the Old Republic. Since then many Jedi have died upon its blade. Prepare yourself to join them!"

- Pre Vizsla

The Darksaber was an ancient lightsaber that was stolen by the Mandalorians during the downfall of the Galactic Republic. It was eventually passed down to the Mandalorian Death Watch member Pre Vizsla. It had a unique black blade that was flattened and came to a point like a traditional sword, rather than the rounded beam of more standard lightsabers, and hummed at a higher pitch as well.

History
During the fall of the Old Republic, this black-bladed lightsaber was stolen from the Jedi Temple by the Mandalorians. By the Clone Wars, it was in the possession of Death Watch member Pre Vizsla, who used it during a duel with Jedi Master Obi-Wan Kenobi.

Behind the scenes
Originally intended to be a vibroblade, George Lucas decided that to preserve the uniqueness of the Jedi weapon, a lightsaber should not be seen to be blocked by a non-lightsaber in such a swordfight. With that in mind, Lucas and the show's crew conceived of an ancient precursor to the lightsaber which they named the Darksaber. Notably, this is also the first canonically black-bladed lightsaber.