Black Card
From Claymore Wiki
Elena's Black Card
Being presented with the Black Card of another Claymore is normally a sign of great respect and trust between them, as Elena did since she and Clare were close during their transformations. It can however be a lure to a trap, as Rosemary did to kill Teresa from her jealousy.
[edit] Known Black Cards Given
Elena: Her Black Card was sent to Clare via Rubel. Clare was reluctant to carry out the killing but Elena insisted that it had to be her.
Hilda: Her Black Card was sent to Miria via Ophelia. However, Ophelia destroyed it and condemned Hilda to become an Awakened Being.
Rosemary: Her Black Card was sent to Teresa as a trap to lure her to a secluded place and attempt to kill her after Awakening.
