“Actually,” said Luke, “I killed him with this.” With his free hand he held out the long thin dagger he had killed the Forsaken with. In the light she could see the blue stones in the hilt. “Do you remember it?” Valentine looked at it, and Clary saw his jaw tighten. “I do,” he said, and Clary wondered if he, too, were remembering their earlier conversation. This is a kindjal, a Circassian dagger. This particular one used to be one of a matched pair.