Anemoi four Anemoi and several minor wind gods are involved in the defense of Mount Olympus against Kronos (the Titan Cronus), the first series's chief antagonist. Both the Greek and the Roman forms of the Anemoi appear in Riordan's second series. Boreas is a central character in "The Lost Hero", and his children Khione, Calais, and Zetes continue to have important roles throughout the series. He resides in Montreal, and is described as "sturdily built...with dark purple wings" when in his Greek form, and as "taller and thinner" when Roman. "Notus/Auster appears in "The House of Hades" as a counselor of
Chione (daughter of Arcturus) Apollo; according to Diodorus Siculus, a whole dynasty of Hyperborean kings and priests claimed descent from Boreas. Chione (daughter of Arcturus) In Greek mythology, Chione or Khionê (Ancient Greek: Χιονη from χιών – "chiōn", "snow") was a consort of Boreas. The account of Pseudo-Plutarch makes her a daughter of Arcturus; she is said to have been abducted by Boreas and brought by him to Mount Niphantes, where she bore him a son Hyrpax, who later inherited the throne of King Heniochus; the mountain was said to have been called "The Bed of Boreas" from that circumstance. The name of Hyrpax