Part 2/8:

One of the central mysteries in Tolkien's mythos is the Dagor Dagorath, known as the "Battle of Battles." While Sauron is recognized as the primary antagonist in The Lord of the Rings, the overarching enemy in Tolkien’s legendarium is Morgoth. Unlike Sauron, Morgoth was not completely defeated at the end of the First Age; instead, he was banished by the Valar to a void beyond the doors of night.