The burden of prophecy weighs heavily on Percy as he faces decisions that will impact not just his own fate, but that of the entire world. Through his struggles, we see how destiny intertwines with personal choice, showing that even when faced with predetermined prophecies, our decisions and actions still matter profoundly.

Throughout the story, Percy learns that true leadership often requires painful sacrifice. Whether it's risking his own life or making difficult choices that affect his friends, he discovers that being a hero means putting the greater good above personal desires and accepting the heavy responsibilities that come with power.

In the face of overwhelming odds, the story demonstrates how cooperation between demigods, mortals, and even former enemies becomes crucial for survival. Ancient rivalries must be set aside, and unlikely alliances form, proving that unity is the greatest weapon against chaos and destruction.