“You don't,” Naoya says, but it came out like a lie. “However, that spells do contain the sound of a cat's footfall, to make it flexible and comfortable. The beard is from Eve, our first mother. The roots are from the mountain where the Cave of Treasure was, where your first human body was buried after it was found. And the last ingredient... is this.” He takes a strand of his own hair. “Hair of Cain, with a trace of his mind and memories.” He lets the strand of hair down, and absentmindedly brushes it. “But that was all formality. The spells themselves are just spells. Data.”