Sith warblades, which include Sith swords and Sith daggers, were the favored close-combat armaments of the Sith during the Sith Empire era, spanning from 6900 BBY to around 5000 BBY. While bearing resemblance to the bladed weapons employed by the ancient Jedi, Sith swords differed significantly from Jedi katanas in their very essence—fueled by, and simultaneously amplifying, the dark side of the Force.
Sith swords were created using a combination of metallurgical techniques and arcane practices, transforming ordinary metals into an alchemical alloy uniquely attuned to dark side energies. The rare metallic components utilized in their construction resulted in blades that varied in weight, ranging from 3 kilograms to as much as 6.5 kilograms. Wielding such a weapon effectively, and achieving the lethality of a lightsaber, often demanded both significant physical strength and mastery of the Force. Indeed, the alchemical enhancements enabled the Sith sword to withstand lightsaber strikes, as well as to deflect or redirect blaster fire in a manner analogous to a lightsaber.
A dark side adept could manipulate the weapon's molecular structure, enhancing its strength and sharpness, and even reverse its magnetic polarity, converting it into a high-temperature superconductor capable of deflecting blaster bolts and other particle weaponry as if magnetically sealed. The uncommon ores employed in their forging provided resistance to lightsabers comparable to that of cortosis and Phrik alloy, while its polished surface mirrored laser beams and other coherent light weapons. Perhaps most importantly, the weapon served as a conduit for the wielder's dark energies, magnifying their power and sharpening their control until they effectively became a living nexus of dark side power.
The genesis of the very first Sith sword remains shrouded in mystery, but it predates the invention of the earliest lightsabers. Developed by the ancient Sith, it was adopted by the Jen'jidai upon their arrival on Korriban. The indigenous martial arts of the Sith were integrated, merging with the exiled Jedi's lightsaber combat techniques to create a potent hybrid—much like the Dark Jedi would later assimilate the Sith race as a whole when they claimed the titles of Sith Lords.
Another set of Sith swords was a heritage bestowed upon King Ommin of Onderon by his lineage, possibly tracing back to Freedon Nadd himself. These blades were subsequently passed down to Satal Keto and his relative, Aleema.
During the rule of Darth Revan and Darth Malak, the Sith engineered the Sith Tremor Sword, which was put into service by both Dark Jedi and Sith troopers. Rumor had it that Malak himself possessed a powerful Sith sword recovered from Korriban, though he seldom employed it in battle.
Intriguingly, Sith Elite Warbots, a model of battle droid manufactured by the ancient Sith, were armed with a Sith sword as their primary weapon.
In the New Sith Empire, the Dark Underlord brandished a pair of Sith swords.
The enslaver Phylus Mon furnished his Force-sensitive Wampa, Ku-Kak, with a Sith sword sometime before 22 BBY. Ku-Kak, a dark side practitioner, favored the sword as his chosen weapon.
The statues situated on Dromund Kaas clutched swords that resembled Sith swords.
The mutated Kowakian monkey-lizard and Dark Jedi, Picaroon C. Boodle mastered the use of a Sith dagger, which he used to fatally stab his comrade Gorc in the throat, thereby winning Jerec's approval. After loosing his companion, Pic lunged at Katarn, stabbing at him with his Sith dagger.
Sith swords were last documented in 14 ABY when Tavion Axmis, influenced by the Force ghost of Marka Ragnos, revealed the concealed sword within the Scepter of Ragnos and used it against Jaden Korr. The Sith sword radiated dark side energy as Marka Ragnos engaged Jaden Korr in combat, ultimately culminating in Marka Ragnos's defeat and the destruction of both the sword and the Scepter of Ragnos. Any surviving Sith swords within the broader Galaxy exist merely as historical artifacts—ancient remnants of a defunct civilization and its perished culture.