Rubat

Rubat was a variant of lightsaber crystal used in the construction of lightsabers. The planet Phemis was the only known source of rubat.

When placed in a lightsaber's crystal chamber, rubat sharpened the appearance and definition of the blade, allowing its wielder to easily track the blade and strike opponents properly. The crystal would also help its wielder attack faster.

The use of rubats was controlled by the Galactic Senate, and later the Galactic Empire. The Jedi Order exclusively used rubats before switching to crystals from Ilum.

Text and facts from the “Rubat” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.