The Testaments are Wilhelm's closest assistants and servants, aiding Wilhelm in his Eternal Recurrence. It is also implied chaos has power over the Testaments, as one of them calls chaos "boss".[1] Wilhelm selects Testaments based on Program Canaan. To become a Testament, one must require a trait known as a "Shining Will". The Testaments are tied to the pasts of protagonists Shion Uzuki, Jr. and Ziggy.