Final answer:
Ares reveals that he's taking commands from someone else through his conversation with Percy in Percy Jackson & the Lightning Thief.
Step-by-step explanation:
In Percy Jackson & the Lightning Thief, Ares reveals that he's taking commands from someone else through his conversation with Percy. When Percy confronts Ares about Zeus's stolen lightning bolt, Ares admits that he did not steal it, but he knows who did. He mentions a 'sleeper agent' who is working for Kronos, the Titan lord.
This interaction reveals that Ares is not acting on his own but is under the influence of a higher power, someone associated with Kronos. This raises suspicions about the motives and actions of other characters in the story.