The Library Tour of Doom: The Kindly Ones!
In Greek mythology, the Kindly Ones—the Εὐμενίδες—is a euphemism for the Furies, the goddesses who “take vengeance on anyone who would swear a false oath” (Hom. Il. 19.260), or those who commit gross impiety like a child who murders their parent, or a host who injures their guest.