The Quest for Ares' Shield was undertaken by Percy Jackson, Annabeth Chase, and Grover Underwood to procure Ares' Shield in return for help on their quest.

Percy Jackson and the Olympians

The Lightning Thief

While on his Quest for the Master Bolt, Percy Jackson was approached by Ares and was set on a quest to retrieve his shield. Ares had left his shield at an old, dysfunctional water park called Waterland. As a reward for their services, Ares gave Percy, Annabeth Chase, and Grover Underwood some supplies and arranged them a ride to L.A. The three then rode in the back of an animal transport truck that only made one stop in Vegas (which turned out to be at the Lotus Hotel and Casino).