Zoe Nightshade is the Daughter of Atlas and Tethys and current Lieutenant of Artemis. She was initially one of the Hesperides but was cast out when she told Heracles how to convince her father to take the golden apples for him. Heracles was supposed to give her credit for the achievement but failed to do so. Her sisters banished her for aiding him.
She grew bitter toward all men as a result and joined the Hunters of Artemis. With this, she quickly ascended to become the Lieutenant of Artemis and has held the position for thousands of years.