Lignan crystal

Lignan crystals were powerful lightsaber crystals that enabled lightsaber blades to last longer and burn hotter. The Sith starship Omen was carrying a load of these crystals when it crashed on the remote planet of Kesh. The crystals became valued antiques, and a great heritage of the Sith. The survivors of the crash, the Lost Tribe of Sith, used some of these crystals in their lightsabers, but reserved them for only their most powerful members. In 41 ABY, Sith apprentice Vestara Khai was given a lightsaber with a Lignan crystal after she was chosen to be an apprentice by Ship, a Sith Meditation Sphere that discovered the Tribe on Kesh.

Appearances

 * Lost Tribe of the Sith: Precipice
 * Omen