The Lightning Thief
After Percy wounds Ares, something strange happens that makes Ares back off. What is it?
Percy Jackson Chapter 20: I Battle My Jerk Relative
Percy Jackson Chapter 20: I Battle My Jerk Relative
From the text:
Something stopped him. It was as if a cloud covered the sun, but worse. Light faded. Sound and color drained away. A cold, heavy presence passed over the beach, slowing time, dropping the temperature to freezing, and making me feel like life was hopeless, fighting was useless.
The Lightning Thief