<Li> A storm or a fire will destroy the world (Leo destroys Gaea with a fire). </Li> <Li> One of the seven will make an oath that is kept until their last breath . Leo vows to return to Ogygia . Leo dies in the explosion that kills Gaea . He is revived thanks to the Physician's Cure . (This also could have been to bring back Festus .) </Li> <Li> Demigods, a giant, and a titan will free the Doors of Death . </Li> <Ul> <Li> Jason Grace: A demigod son of Jupiter . Jason suffers amnesia at the beginning of the book and is inclined to call the gods by their Roman names . He owns a coin that turns into a sword or a lance depending upon heads or tails, although it is destroyed during their quest . He is 15 years old and Thalia Grace's younger brother, although Thalia was born under the Greek aspect of Zeus while Jason was born under the Roman aspect, Jupiter . Jason was offered to Hera as a champion at the age of two, which later provoked Thalia to run away from home . Before the start of the book, he lived in Camp Jupiter, the Roman counterpart to Camp Half - Blood . He harbors feelings for Piper McLean, but at the end of the book it is hinted that he was romantically involved with a girl named Reyna before . </Li> <Li> Piper McLean: A demigod daughter of Aphrodite and Tristan McLean, a Cherokee movie star . She is Jason Grace's girlfriend and has a dagger named Katoptris, previously wielded by Helen of Troy . She also has the rare gift of charmspeak, the ability to persuade anybody to do anything . She is 15 years old and her eyes change color from green to brown to blue . She has choppy, uneven brown hair that she cuts herself, refusing to make it neat . </Li> <Li> Leo Valdez: A demigod son of Hephaestus and Esperanza Valdez . Leo claims to be Jason's best friend at the beginning of the book, and although that was a trick of the Mist, he and Jason do become good friends as they get to know each other on their quest . He has a magical tool belt that will produce any tool he requests that can be found in an average mechanical shop . Leo repaired the bronze dragon Festus . He can also create fire from nothing, a rare ability sometimes given to Hephaestus's children . He had a crush on Khione, the goddess of snow, and on Thalia Grace, Jason's elder sister . </Li> </Ul>

How many words are in the lost hero by rick riordan