Here's why this is the climax:
* Percy's journey culminates here: Percy has been on a quest to clear his name and find the stolen lightning bolt. He's faced numerous challenges and finally confronts the true villain, Ares, who orchestrated the theft.
* A powerful confrontation: The fight between Percy and Ares is intense and filled with action. Percy uses his demigod powers and his wits to overcome the powerful god.
* The stakes are high: Percy's failure could lead to war between the gods, and he is also protecting his friends, Annabeth and Grover, who are with him.
* The revelation of the truth: During the fight, Percy discovers the truth about the lightning bolt and the true culprit behind the theft. This revelation leads to a confrontation with Zeus, who initially believes Percy is guilty.
* Resolution and consequences: Percy's victory over Ares and the revelation of the true culprit leads to the resolution of the conflict and sets the stage for the future of the series.
This scene is the culmination of all the tension and action that has built up throughout the book. It is a turning point for Percy, as he proves his strength and courage, and for the story as a whole.