Darth Tenebrous's lightsaber

A red-bladed lightsaber was constructed by the Bith Dark Lord of the Sith Darth Tenebrous sometime in his apprenticeship under his master.

History
Darth Tenebrous constructed a red lightsaber during his Sith training, and would go on to wield the weapon when he either sparred or honed his lightsaber combat skills. As an apprentice, he possibly based the design off his master's weapon, as the Padawan learners in the Jedi Order do. ]]

When Tenebrous selected the Muun Darth Plagueis as his apprentice, Tenebrous's lightsaber was possibly used for Plagueis to base his weapon off. After the Bith was killed by Plagueis on Bal'demnic in 67 BBY, it can be assumed that the lightsaber was either destroyed or left with the corpse, though, as the Sith Order hid from the Jedi, the lightsaber was possibly destroyed.

Appearances

 * Star Wars: Darth Plagueis