The third video in a series of timeline entries from the Sith Archives on Korriban.

BTC 440 The Sith scientist Darth Foucault explains the panoptic philosophy of power that operates as a core principle in the construction of Resurrection Holocrons.
Sith holocrons were immediately identifiable with respect to Jedi holocrons, as they were usually pyramidal in shape, and etched with strange symbols and ancient hieroglyphs. Inscriptions usually lined the bottom of the device, and various dark incantations were found all over the smooth surface. At the holocron's apex rested a black crystal, used to power the holocron's store of information.
The design of the holocron was not the only way to discern its affiliation: Sith holocrons emitted a dark presence, creating tremors in the Force upon activation.

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