Sinew Verginix (née Tatum) was a Slaughterer girl who appeared during the events of Beyond the Deepwoods. Twig met her after rescuing her brother, Gristle. Many years later, after losing his sky ship and his crew, Twig returned to her village, remembering the hospitality of the slaughterers. They fell in love, married, and had a child, Keris. Sinew died of a fever about a year after Keris was born, and, after a period of grieving, Twig struck out again into the Deepwoods to resume his search for Riverrise.

Sinew was also the narrator of one of the short stories about the peaceful life of the slaughterers in their village published in one edition of Beyond the Deepwoods.