| abstract | - Sometime around the end of World War II, the Oracle of Delphi delivered a prophecy stating that the next child of the Big Three to turn sixteen could be responsible for saving or destroying Olympus. The Big Three had also been watching the war below, as it was fought between their demigod children and they agreed that they were influencing mortal events too much. Because of the potential danger of the Great Prophecy, and the fact that World War II was fought between their children, they vowed to have no more children with mortals. Despite agreeing to the deal, Hades already had two children under the age of sixteen, Bianca and Nico di Angelo. Zeus in order to make sure they didn't turn on the gods, ordered Hades to bring them to Camp Half-Blood so they could be trained, but Hades knew it was really so they could be watched. When the deadline passed, Zeus tried to kill them to prevent them from reaching the age of sixteen, but Hades protected them and sent them to the Lotus Hotel and Casino to hide. As the decades passed, the Big Three stayed true to their oath, but eventually Zeus fell in love with a movie star and they had Thalia Grace. Upon his discovery of Thalia, Hades - who was still bitter over Maria's death and shocked at his younger brother's hypocrisy - was outraged and, sent the most dangerous monsters of the Underworld out to kill her, which he almost did until Zeus spared her life and made her a tree. Poseidon also had a child a short time after Zeus did. After the Second Titan War and the passing of the Great Prophecy, the gods felt they had no reason to stay true to the pact as it didn't work in the first place and because strong demigods weren't a bad thing.
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