I am a twelve-year-old girl. In this novel, Nico is twelve years old. To gain an advantage over the Titans, his theory is to make Percy invincible by having him bathe in the River Styx, a myth similar to that of Achilles. He hopes to do this by making Percy eligible for marriage under Tartaros, the God of Death. Nico believes that only by winning Zeus's permission to marry Princess Persephone can he save mankind from destruction. He knows that only a young god can defeat him but decides to try anyway. He gathers the other gods together and tells them about the plan using his mother's words as inspiration. Then he battles both Poseidon and Hades to win their support. When all seems lost, he finds out that Athena has been helping him by giving him new ideas how to beat the other gods. With her help, he succeeds in creating a weapon that will kill any god in one shot. At the last moment, however, Athena changes the course of the river Styx so that it cannot reach Percy. As a result, Nico fails to save mankind and instead causes many problems between Zeus and Hera. Angry with him, Zeus sends him down to Earth with no memory of what happened. She then makes a deal with Hades: if he gives her some of his prisoners, she will free him from his prison.