A Tainted Nightsister Crystal represented a specific variant of kyber crystal. These crystals were forged by the Nightsisters for implementation in armaments analogous to lightsabers. The creation of this crystal involved immersing it within the magical ichor found on Dathomir, a process that corrupted its inherent link to the Force. Weapons employing this crystal type produced a noxious, suffocating green [smoke](/article/gas] when activated.