Melkor, later known as Morgoth, is one of the most powerful beings in Tolkien's universe. He is a Vala, one of the angelic beings created by Eru Ilúvatar, the supreme deity in Tolkien's mythology. Melkor was the primary antagonist of "The Silmarillion" and played a significant role in "The Lord of the Rings." He was a master of darkness, manipulation, and creation, capable of producing incredible works of art and power. However, his thirst for control and dominance led him to rebel against his fellow Valar and seek power over Middle-earth.