Sith sword

From the Encyclopedia of Speculative Fiction - http://encyclopedia.wizards.pro

Sith swords were weapons used by the Sith during the Sith Empire. Developed by the Ancient Sith, it was adopted by the Dark Jedi when they arrived on Korriban. Sith swords were altered by Sith Alchemy to be harder and sharper. They were never dulled, could block blaster fire, and were even able to resist Lightsabers. Quite a few Sith Lords used Sith swords rather than lightsabers - either for tradition, or because they preferred the more visceral feeling of sword cutting through flesh.

After the fall of the Sith Empire, the majority of the Sith abandoned Sith swords in favor of the more effective lightsabers. Under Darth Revan and Darth Malak's rule, the Sith developed the Sith Tremor Sword.