Xenosaga is a series of role-playing video games developed by Monolith Soft and published by Namco. The series is known for its deep narrative, which combines elements of science fiction, philosophy, and religion. It primarily follows the journey of Shion Uzuki and her companions as they confront the mysterious entity known as Gnosis and uncover the secrets of the universe. The series consists of three main titles: Xenosaga Episode I: Der Wille zur Macht, Xenosaga Episode II: Jenseits von Gut und Böse, and Xenosaga Episode III: Also sprach Zarathustra. Each game features turn-based combat and explores complex themes, including the nature of existence and the conflict between humanity and technology.