Seven half-bloods shall answer the call,

To storm or fire, the world must fall,

An oath to keep with a final breath,

And foes bear arms to the Doors of Death

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This was the prophecy given by Rachel, in the Heroes of Olympus series, that was given meaning throughout the story. It talks about the seven half bloods, Percy, Annabeth, Jason, Piper, Hazel, Frank, and Leo, working to save everyone from the Earth goddess Gaea.