What is the importance of the Egg Alien's Final Earth in the novel, On False Earths?

The Egg Alien's Final Earth is where Jadna finally catches up with the Egg Alien and where dozens of the Valerian clones are killed in a conflict that mimics a World War I battle. The Final Earth is located in space, but it is filled with documents and items from Earth's history. The pieces include statues, books, and furniture such as a coat of arms, a marble statue, a saddle, and a chair that resembles a throne.