Prophecy
Prophecies are predictions of the future. Usually, a prophecy will foretell some form of a major event about to happen or an event that will happen much later in the future.
Prophecies can appear in a number of ways, but almost all are cryptic and their true meaning will not become clear until after the events of the prophecy have come to pass. Also, those with the ability to see the future are unable to reveal what a prophecy means, as giving the answer would make the answer irrelevant (meaning that the events in the prophecy could change if the events are told). It is also said that trying to figure out what a prophecy means or trying to force a prophecy to come to pass may result in disaster.
The most common way for a prophecy to be told is from an oracle, most notably the Oracle of Delphi. Even in ancient times, people would come from all over @Greece and beyond to see the Oracle, who would speak the prophecies of @Apollo. Over time the spirit of the Oracle went from host to host, eventually arriving in the @United States. The Oracle would speak prophecies for quests for demigods, and even spoke the first Great Prophecy, warning of the possible destruction of Olympus. This prophecy eventually leads Hades to place a curse on the Oracle, trapping her in her current body. Even after death, the Oracle spoke prophecies to demigods at @Camp Half-Blood until she was eventually replaced by @Rachel Elizabeth Dare, who spoke the next Great Prophecy, later called the Prophecy of Seven. Other Oracles include the Oracle of Dodona, controlled by the Titaness @Rhea, located in the woods of Camp Half-Blood, the Oracle of Trophonius, located in the Bluespring Caverns south of Indianapolis, and the @Herophile, the Oracle of Erythaea, who speaks prophecies in the form of word puzzles.
The Roman Legion, however, relies on the @Sibylline Books, a collection of books that were said to outline every major event in the history of Rome. The books, however, were said to be lost, with only a few pages surviving a fire. The prophecies that were saved were engraved on the floor of the @Temple of Jupiter Optimus Maximus and are watched over by an Augur. Augurs are also able to see the will of the gods, usually with sacrifices of some kind. Depending on the skill of the Augur, a prophecy can appear unclear or the Augur cannot understand the message (as shown when @Octavian was not sure if the message was "The Greek has arrived" or "The goose has cried" ). Recently, the Romans have found the harpy @Ella, who had memorized parts of the Sibylline Books before they burned. She is working to transcribe the books by tattooing them on @Tyson's skin.
Prophecies themselves can take two forms. The ones given by the gods reflect the will of the gods. They decide when they are revealed and often know their meanings. The ones given by Oracles are independent of the gods. They cannot always understand what the prophecy means nor can they control when it is given. Sometimes a prophecy can be spoken without the permission of the gods including @Zeus and Apollo.
Given Prophecies
Lightning Thief Prophecy
You shall go west, and face the god who has turned, You shall find what was stolen, and see it safely returned, You shall be betrayed by one who calls you a friend, And you shall fail to save what matters most, in the end.
@Percy Jackson heads west with @Grover Underwood and @Annabeth Chase in order to meet @Hades, thinking he is the god who betrayed the Olympians and took the @Master Bolt from Zeus. However, it is later discovered that @Ares had aided @Luke Castellan in stealing the Master Bolt and the @Helm of Darkness in hopes it would start a war.
Percy later finds Zeus' Master Bolt in a backpack given to him by Ares. He returns it to Zeus, as well as Hades' Helm of Darkness, which was also in the possession of Ares.
Luke Castellan pretended to be Percy's friend when they first met, even supplying Percy with some @Winged Shoes to aid him on his quest (which Percy gave to Grover). It is revealed however that the shoes were a trap for Percy. The shoes were meant to pull Percy into Tartarus with the Master Bolt for @Kronos. When this fails, Luke tries to kill Percy with a Pit Scorpion before leaving the camp.
In the end, Percy failed to save his mother. He had to leave her in the Underworld with Hades as he only had three pearls. Hades returns her after receiving his Helm of Darkness.
Sea of Monsters Prophecy
You shall sail the iron ship with warriors of bone, You shall find what you seek and make it your own, But despair for your life entombed within stone, And fail without friends, to fly home alone.
@Clarisse La Rue sailed aboard the CSS Birmingham with skeleton warriors, supplied to her by her father, Ares.
She, Percy, Annabeth, and Tyson find the @Golden Fleece and take it from @Polyphemus. Percy later gives Clarisse the fleece because it is officially her quest.
She is trapped in @Polyphemus' Island and despairs for her life.
She's destined to fail without Percy, Annabeth, Grover, and @Tyson, but if the quest succeeds she will end up flying back alone.
Titan's Curse Prophecy
Five shall go west to the goddess in chains, One shall be lost in the land without rain, The bane of Olympus shows the trail, Campers and Hunters combined prevail, The Titan's curse must one withstand, And one shall perish by a parent's hand.
The group consisting of Zoë, @Thalia Grace, Grover, Bianca, and Percy (originally Phoebe). The questers travel to @Mount Othrys in the west to free @Artemis from her captivity.
Bianca sacrificed herself in the desert to save the group against a defective prototype of @Hephaestus' robot, Talos.
They followed the @Ophiotaurus, which was called the bane of Olympus because if he was sacrificed in flames, the person that sacrificed it would have the power to destroy Olympus. During the quest, it keeps appearing in various bodies of water.
The only way the quest would be successful was if campers and the @Hunters of Artemis worked together. The quest consisted of three campers (Percy, Grover, and Thalia) and two Hunters (Bianca and Zoë)
In order to win the battle at Mount Othrys, someone will have to take the Titan's Curse and free Artemis of her burden so that she can fight. Percy Jackson withstands the Titan's Curse after realizing he has no chance to beat @Atlas, partly.
In the end, Zoë was killed by the poison from the dragon @Ladon cause of her Titan father @Atlas.
Battle of the Labyrinth Prophecy
You shall delve in the darkness of the endless maze, The dead, the traitor, and the lost one raise. You shall rise or fall by the ghost king's hand, The Child of Athena's final stand. Destroy with a hero's final breath, And lose a love to worse than death.
Annabeth, Grover, Percy, and Tyson enter the @Labyrinth to find @Daedalus. The Labyrinth goes on forever, ever-changing and expanding.
@Nico di Angelo, son of Hades, raised the dead; @Ethan Nakamura, the traitor, was spared; and Pan's spirit and the message are spread into the world.
'The Ghost King' was Nico (since he is a son of Hades, the god of the Underworld), who decided to help Annabeth and the rest of the campers. If he had refused, the rest of the questers would not have survived.
A child of Athena's final stand refers to Daedalus, one of Athena's children, because he dies during the Battle of the Labyrinth.
The Labyrinth was destroyed with Daedalus' last breath, as he and the maze's life force were tied together. Daedalus asked Nico to free his soul, in order to destroy his creation.
Annabeth loses Luke to Kronos. Seeing a loved one used as the vessel of the evilest entity imaginable is far worse than them merely dying.
Lost Hero Prophecy
Child of Lightning, beware the earth, The giants' revenge, the seven shall birth, The forge and dove shall break the cage, And death unleash through Hera's rage.
Son of Neptune Prophecy
Unlike previous prophecies, there are two parts to this one, given by @Ares as Mars and @Ella.
Go to Alaska. Find Thanatos and free him. Come back by sundown on June twenty-fourth or die.
To the north, beyond the gods, lies the legion's crown. Falling from ice, the son of Neptune shall drown.
Part One:
@Frank Zhang, the leader of the quest, @Hazel Levesque, and Percy Jackson make it to Alaska after several different trials and close calls.
Frank, while being protected by Percy, is able to free @Thanatos using his piece of "life wood." With Thanatos free, monsters will not revive as fast and fewer escaped souls will be able to leave the @Underworld.
They make it back to @Camp Jupiter, which was under attack by @Polybotes and the @Giant Army. If they had arrived any later, Camp Jupiter and everyone in it would have most likely died.
Part Two:
Alaska is referred to as the land beyond the gods. It is also the most northern state in the @United States. This is where the 12th Legion's Eagle is located, being guarded by @Alcyoneus.
The prophecy, since incomplete, becomes quite unclear. It may refer to either of the following:
Percy feels that it may refer to him drowning in Gaea's territory (land) when he fell in the muskeg in Alaska.
As Frank assumed, Percy drowned in Alaska when he fell off the glacier while battling the shades, although he was unharmed as Percy can't actually drown as the son of Poseidon. (this is most likely because the prophecy mentioned "falling from ice"); or
As Hazel suggests, that Percy may drown his enemies as he did at the frozen Roman camp with the shades.
Mark of Athena Prophecy
Wisdom's daughter walks alone, The Mark of Athena burns through Rome. Twins snuff out the angel's breath, Who holds the key to endless death. Giants' bane stands gold and pale, Won through pain from a woven jail.
Annabeth, daughter of Athena, had to complete her own quest alone - without friends or special powers.
The @Mark of Athena, a coin that led Annabeth through Rome to find the @Athena Parthenos.
The twins being Ephialtes and Otis kidnapping Nico di Angelo and placed him in a jar with no air. Nico only managed to survive by going into a death trance. Nico is referred to as the angel due to his last name.
Nico has the knowledge of where the two sides of the @Doors of Death are, in the Mortal world and in the Underworld. However, with the Doors of Death still open, the dead will continue to rise.
The fifth line refers to the Athena Parthenos statue, which is made of ivory and gold. It also holds some special power to help defeat the Giants.
Annabeth and the crew of the Argo II retrieved the Athena Parthenos from the chamber of @Arachne.