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The Quest for Thanatos
Frank Zhang; Percy Jackson; Hazel Levesque; the three who go out to search for Thanatos.
Information
Goal	Free Thanatos
Quest Leader	Frank Zhang
Number of Members	3
Other Members	Percy Jackson Hazel Levesque
Prophecy	Prophecy in The Son of Neptune
Location	Across the United States and Canada
Book	The Son of Neptune
Result	Thanatos and Camp Jupiter are saved

The Quest to Free Thanatos is a quest taken up by demigods Frank Zhang, Percy Jackson, and Hazel Levesque to save the Greek 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 the Harpy 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 incomplete in that the shades were the ones that were drowned by Percy.