Black Crystals were used as the power source of for the Sceptre of the Ancients and were discovered by the Faceless Ones who realised the crystals sang to them. The Ancients stole them in their fight against the Faceless Ones. Only a descendant of the Ancients could touch the crystals; otherwise, the bearer would turn to dust. When Valkyrie Cain's reflection held the sceptre, she didn't test to see if this rule applied to reflections.
- Main article: The Sceptre of the Ancients