A device designed by Vieve that Sophronia wears clipped to her wrist. When the catch at one end is flipped, a spring-loaded release mechanism allows the wearer to fling the device, which has a grapple with a rope attached.

The original device is lost by Sophronia during the events of Waistcoats & Weaponry. Vieve creates a new one for her, with several modifications. It is smaller, stealthier, emits faster, and has an added winch to pull taut as needed.

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