Khione is the Greek goddess of snow, daughter of Boreas, god of the North Wind, and sister of Zethes and Calais. She is depicted as a goddess in the series, while in mythology she is visualized as a snow nymph. Her Roman form, Chione, is sometimes used as merely an alternative way of spelling her name. Later when the demigods were flying over Detroit, she summons a strong wind to knock Festus out of the sky and freezes the wires in his head which damages the control disk, thus preventing him from flying. Leo is confused about the frozen wires but didn't suspect it was Khione.