- the main conflict of the story is, They need to save the Tree (Thalia) that protects Camp-Half Blood by bringing the Golden Fleece from the Sea of Monsters. On the same time, they will save Grover from the cyclopes and make ares proud of Clarisse. So this concludes that the main conflict is internal & external : because Percy is doing it for himself and for his brother , friends , and everyone in camp half - blood. Including the Thalia tree to overall protect them from outside forces.