The Heroes of Olympus is a five-book series focusing on teenage demigods who live in modern times and are the children of the ancient Greek and Roman gods. The seven Greek and Roman demigods must work together to leave their home camps in the United States and travel to the ancient lands in Rome and Greece. There, they must battle many enemies, especially the primordial goddess Gia, who wants to destroy the gods and the world as we know it. Once they accomplish this giant task, they return home and improve the demigod world by uniting the Greek and Roman camps in the United States.

In 3-5 sentences, explain the elements from the description that illustrate the common patterns of a hero's journey.

The first element from the description that illustrates the common patterns of a hero's journey is the call to adventure, where the seven demigods must leave their home camps and travel to ancient lands to battle enemies and face challenges. This is followed by the challenge and trials the demigods must overcome, represented by their battles with Gia and other foes. Additionally, the idea of the demigods returning home after their journey with newfound knowledge and uniting the Greek and Roman camps exemplifies the concept of the hero's return with the elixir, bringing positive change to their world. These elements demonstrate the classic structure of a hero's journey, including departure, initiation, and return.