Pulas

The Pulas was a black, fist-sized crystal that radiated dark side energy. Over the years, the Pulas was wielded by various members of the Sith Order, until it disappeared around the time of the Ruusan campaign. The crystal subsequently lay abandoned inside a Sith fortress on the planet Almas for centuries. Around 31 BBY, the Pulas was rediscovered by a group of Jedi researchers who were exploring the citadel, and the artifact was taken to the Almas Academy, a Jedi academy that was located on the world. However, the facility's headmaster, Lanius Qel-Bertuk, feared that the Jedi could not keep the Pulas safe from the clutches of a group of Sith cultists who were active on Almas, and he arranged for the crystal to be transported to the Jedi Temple on the planet Coruscant for safekeeping. Though the cultists attempted to steal the Pulas while it was en route to Coruscant, the artifact was successfully relocated to the Jedi Temple.

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