Melkor / Morgoth

Melkor (Quenya;IPA: "He Who Arises In Might"), later called Morgoth, is the first Dark Lord and master of Sauron. Originally the most powerful of the Ainur created by Eru Iluvatar, Melkor rebelled against his creator out of pride and sought to corrupt Arda, becoming Morgoth. After committing many evils in the First Age, such as the theft of the Silmarils and the destruction of the Two Lamps, Morgoth was defeated by the Host of Valinor in the War of Wrath.

According to an unpublished portion of Tolkien's conclusion to The Silmarillion, Morgoth will return at the end of the world to fight against good in Dagor Dagorath, the final battle.

Stats
Classification: Dark Lord, Magical

Weaponry: Mace, Magic

Destructive Capacity: Small Island Level

Speed: Hypersonic+

Durability: Small Island Level

Opponents
Morgoth vs. Nagash

Morgoth vs. Sargeras