"They used to use these to take down all kinds of Witches, right?" she asked, holding it up to the light. "Oh, pretty."

'Pretty' was the runes carved over the surface, some of which she recognized from DCI Garrett's class. Good for the Hunter, not so great for the prey. "So my ghost gave this to Robin-chan? Why?"

That was the question, wasn't it, and Dōjima's eyes lit up with a Plan. "Karasuma! Try scrying it!"