This Sith holocron was hidden by acolytes on the forgotten planet of Kruskan, around 3,000 BBY.
Characteristics
The holocron was shaped like a pulsing sphere and was said to be powerful.
History
The holocron was kept in a secret mountain stronghold, only rediscovered long after it had turned to ruin. Servants of the noblewoman Regera Girawn found the device, and brought it to her. Sensing Force-potential in her, the holocron shot out a purplish light and destroyed itself, burning her hands and face and awakening her to the powers that lay dormant. It fed Girawn with visions of the past, present and the future and drove her insane, starting her new life as a darksider.
Sources
"Regera Girawn, Force Witch" on Wizards.com (content now obsolete; backup link)