The Holocron of Belia Darzu was a Sith holocron created by Belia Darzu, a Dark Lord of the Sith who reigned during the last quarter of the New Sith Wars. A four-sided pyramidal device, the holocron contained Lord Darzu’s knowledge of the dark side, particularly Sith alchemy and the Force power known as mechu-deru. Following Darzu’s assassination, the holocron remained inside her stronghold on the planet Tython, serving as the final vestige of her power. Centuries later, the holocron of Belia Darzu was recovered by Darth Bane, a Sith Lord who sought the secrets to constructing such a device of his own.

Created by the female Shi’ido Dark Lord of the Sith known as Belia Darzu, the holocron was a four-sided device that was shaped in the form of a pyramid. The holocron contained a crystal matrix capable of storing large amounts of information, among which included Darzu’s philosophical views on the Force, as well as her knowledge of Sith alchemy and the dark sidetechnique known as mechu-deru. In addition, it held instructions regarding the construction of a holocron, detailing the entire process—including the elaborate Rite of Commencement—while showing cutaway images of such a device. Upon activation, the holocron projected an avatar of Lord Darzu to serve as its gatekeeper, mimicking her physical appearance and her inborn ability to shape-shift.