1. Message:
* The arrival of Luke Castellan and his fellow demigods, as well as Kronos' awakening. Amphitrite warns Percy that Luke, his former best friend, has turned against the Olympians and is working with Kronos to destroy the world.
* The importance of Percy's role in the prophecy. She emphasizes that Percy is "the one" destined to prevent Kronos' rise to power.
2. Warnings:
* The danger of his own feelings and emotions. Amphitrite warns Percy that his emotions, particularly anger and fear, can be manipulated by the forces of darkness. She urges him to control his anger and fear and stay focused on his purpose.
* The dangers of trusting too easily. She subtly warns Percy not to trust everyone, especially those who seem too good to be true.
In essence, the woman in the water serves as a prophetic figure, emphasizing the imminent threat and Percy's crucial role in preventing it. She also highlights the importance of self-control and discernment in the face of danger.