“ He snatched her needle from her grasp, He held it in his claws, testing the balance and sharpness. “A fine weapon, but not sufficient for the Ritual.” His talons erupted in fire, which spread across the needle. Hornet watched helplessly, fearing that it would be melted to slag. To her surprise, something else entirely happened. The needle’s gleaming polish turned from fine silver to tarnished black metal. The sheen became a wicked scarlet when the light hit it just right. Grimm held it aloft, before handing it to her. “Behold my handiwork: the Grimmtooth. Now begone…and for the sake of your sibling, I suggest you slay something before nightfall.” He warned. Hornet just stood, staring at the weapon.
From the fourth chapter of “ Burning Silk:
https://archiveofourown.org/works/22903132/chapters/54849565