Melkor, Morgoth

Morgoth, also known as Melkor, was the greatest of the Ainur. He fell from glory when he disrupted the Music of the Ainur and defied the will of Ilúvatar. Morgoth corrupted many of the Ainur to his service, fought the Valar, and marred Arda. His theft of the Silmarils and wars against Elves and Men encompassed much of the history of the late First Age. Eventually, Morgoth was bound in chains by the Valar and thrown into the Void, leaving the permanent damage his evils had done