Dual Phase Lightsabers

From Wikipedia of the Dark Brotherhood, an online Star Wars Club

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Examples of dual-phase lightsabers have been used by Jedi and Sith alike including Exar Kun, Darth Vader and Corran Horn.

Requirements

Due to the difficulty in aligning the crystals for a Dual-Phase Lightsabers, only a Dark Jedi Master can attempt to build one.