Dark, imposing, devious, powerful beyond measure, Sauron is evil personified in the Lord of the Rings universe. He is the starting point when it comes to evil in the tale of the Lord of the Rings. It's one of the main reasons why The Lord of the Rings is considered the pinnacle of epic fantasy fiction. But he's not an overly complex villain, with morally gray motivations that some might say are necessary if an evil character, especially a central one, is to be considered important and beneficial to the plot. But the genius of Sauron's villain is his absence of complex reasoning or motivations that could be seen as not entirely evil. His only goal is to destroy the world of men. He cannot be reasoned with or sympathized with, and this is why the insatiable, omnipotent, and purely destructive nature of his evil is so vital to the Lord of the Rings. Sauron and his purely diabolical nature are the constant against which each protagonist leans and is tested, and the podium on which Tolkien showcases the character growth of many protagonists in this novel from the beginning of the story to the end . Everything Tolkien uses to describe Sauron defines him as this enormous, untouchable power that there is little, if any, chance of overcoming. It is no mistake that the story begins in the innocent, lush Shire, where innocent hobbits run amok without a care in the world, while Sauron is in Mordor, almost on the other side of the world. This immediately establishes him in the readers' minds as an almost divine entity, in an untouchable place. So when Gandalf informs Frodo exactly what the Ring that Uncle Bilbo gave him is, that it is "the Master's Ring, the One Ring to rule them all" and who it belongs to, the n... . in the center of the card... in his hands, and a light was around him." Aragorn is just one example of a protagonist who changes from the beginning to the end of the story, and each improves in his own way. . Whether it's the friendship between Legolas and Gimli that blossoms even though one is an elf while the other is a dwarf, or Faramir's ability to accept himself, despite his father's approval of Boromir, there are dozens of characters that change .When your villain is one dimensional, it gives you a basis to change your other characters effectively and efficiently were it not for the danger Sauron poses to the entire world, and the evil that extends to many people and different locations, hitting them all, Tolkien wouldn't have been able to create such depth in so many characters in such an organic and natural way, and that's what makes his nature vital to the story as a whole.