In Rick Riordan's The Heroes of Olympus series, it's on the Feast of Spes that the primodial deite Gaia wants to rise.
Bianca and Nico spent the next 70 years in the Lotus Hotel before Hades had Alecto took them out and put them in a military school in Bar Harbor, Maine, hoping to have them fulfill the Great Prophecy.
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Hazel Levesque is a fictional character in The Son of Neptune, the second book of Rick Riordan's The Heroes of Olympus series, where she is one of three narrators.