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.
Khione is the daughter of Boreas, the North Wind and Oreithyia, whom he abducted. She was loved by Poseidon and had him a son, Eumolpus. In fear of her father's wrath, she cast the child in the sea, but Poseidon saved him and entrusted him to the care of Benthesikyme. The Eumolpidae in charge of the Eleusinian mysteries claimed descent from her, as the mother of Eumolpus with Poseidon. She was hardly ever represented in Greek or Roman mythology.
When Jason Grace, Piper McLean, and Leo Valdez visit Boreas's penthouse suite in Quebec, they were given a not-so-warm welcome by Khione and her two immortal demigod brothers Zethes and Calais. As soon as he sees her, Leo develops an instant crush on her, but she doesn't like him because she can sense the fire within him. She makes him wait with Calais while she and Zethes take Jason and Piper to see her father, Boreas. She supports the idea of turning them into ice statues, but her father disagrees and she is extremely angry at him, but was forced to listen resulting in her letting them go.
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.
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