Quest for Thanatos

A quest taken up by Frank Zhang, Percy Jackson, and Hazel Levesque to save

the god Letus from Alcyoneus and prevent the destruction of Camp Jupiter by Polybotes in The Son of Neptune. The prophecy was ironically given by Mars to the augur Octavian, during his visit to Camp Jupiter. Eventually the harpy, Ella, would start to say two lines from the prophecy that she read.

Mars prophecy: "Go to Alaska. Find Thanatos and free him. Come back by sundown on June twenty-fourth or die."

However, this is not the true prophecy as it was lost along with the Sibylline books. Ella does recite a part of the prophecy while talking to Frank.

Ella's prophecy: "To the north, beyond the gods, lies the legion's crown Falling from ice, the son of Neptune shall drown"

Hazel speculates that the second line was missing in that the shades were the ones that were drowned by Percy.