Sauron didn't need to use Uruk-hai because he already had massive armies of standard Orcs, and the Uruk-hai were Saruman's specific, superior breed (Orc/Man hybrids) meant to serve him, giving Sauron a powerful, loyal force from a rival who he later manipulated, rather than needing to create his own (though Sauron did have powerful "Black Uruks" too). Saruman’s Uruk-hai were tough, sun-resistant soldiers, but Sauron's vast numbers and control through fear (and the One Ring's influence) meant he could overwhelm foes without relying solely on Saruman's specialized troops, and he eventually turned Saruman's creations against his enemies anyway.
In trilogy, Saruman appeared to believe that the Uruks were his invention. In The Fellowship of the Ring, Gandalf mentions Saruman creating Uruks by crossbreeding "Orcs with goblin men." He states that they are "An army that can move in sunlight and cover great distance at speed."
It tells you why right in the book, Sauron releases him because he knows Gollum will go after the ring, and can be watched, leading Sauron to the ring.
All the rings did was to fuel the greed of dwarves and they served themselves, rather than fall under control of Sauron, although their greed led to their downfall, they were still not under control of sauron, that's why Sauron wanted the 7 rings brought back to him.
Why did Fili and Kili have to die? There are a few different theories as to why Tolkien had Fili and Kili die at the end of The Hobbit. One theory is that he was emphasizing the important and loyal role that Fili and Kili had as sister-sons of Thorin, an important relationship in medieval literature.
Instead, we have to consider that Sauron, the original owner, is not human, but has a quasi-divine status. Therefore ownership of the Ring is subject to Divine Law. With this precedent in mind, many of the ambiguities clear up nicely. After numerous transfers by violence and trickery, Frodo is the true owner.
As a Maia, Gandalf was an angelic being in human form, in service to the Creator (Eru Ilúvatar) and the Creator's 'Secret Fire'. He took on the specific form of an old man as a sign of his humility. His role was to advise but never to attempt to match Sauron's strength.
Tolkien's description of Gollum conforms to a Catholic – and Thomistic – account of envy, which is a “sadness of the soul”; and it is Gollum's unbearable sadness and his unquenchable desire for the one Ring that marks his character.
His task was to do the bidding of his masters and so when he proved unfaithful in doing that task his masters stripped him of his robes and gave them to one who would do their bidding. Gandalf is now the White, Saruman as he should have been.
The Nazgul are Sauron's chief enforcers, acting as his special forces in Middle Earth. They don't hold command over armies but are deployed when Sauron needs to act far from his territories. The Mouth of Sauron is the head of Sauron's diplomatic efforts.
The orcs "multiplied" like Elves and Men, meaning that they reproduced sexually. Tolkien stated in a letter dated 21 October 1963 to a Mrs. Munsby that "there must have been orc-women". In The Fall of Gondolin Morgoth made them of slime by sorcery, "bred from the heats and slimes of the earth".
Elrond chose the fate of the Elves and therefore the choice was presented to his children. The reason why Eldarion and his sisters (the children of Aragorn and Arwen) were born mortal was because Arwen chose mortality and therefore that fate was passed on to the rest of their line.
Sauron needed Gandalf out of the picture permanently, as he was the only enemy with the knowledge, leadership and determination to thwart him. His biggest mistake was ego. He succeeded by trickery, by his ability to deceive others. He conquered so much land that his ability to control became out of reach .
It's possible that Gollum's prolonged search for the ring allowed it to maintain a significant power over him, suspending his aging process. In contrast, Bilbo's exposure to the ring's influence waned after he willingly (mostly) relinquished it, allowing his aging to resume more noticeably.
It's not the years; it's the mileage. Gandalf isn't a Maia in the same way Sauron is. He was sent to middle earth as an old man, so his body is much more real than Sauron's “raiment”. He can't use his power to the same extent, he can't change his forms at will.
A group of UCL medical students, led by Dr. Liz Sampson, concludes that Gollum was actually suffering from schizoid personality disorder.
Gandalf does not WANT to touch the ring. Just as Galadriel resists the temptation to take it when Frodo offers it to her willingly. And all this because "Power Corrupts". Sauron and the Ring are allegories for the corruption that inevitably arises when too much power is concentrated in one place.
But that's actually the answer: Eru Said So . The Undying Lands are a place for immortal beings (Eldar), and mortals are forbidden from entering.
Exclusive worldwide rights to motion picture, merchandising, stage and other rights in certain literary works of J. R. R. Tolkien including The Hobbit and The Lord of the Rings were sold by Tolkien himself to United Artists in 1969, reportedly for a small amount, and are currently owned by Middle-earth Enterprises ( ...
The Ring's effects
Inversely, the hobbits' good-naturedness and lack of ambition makes them less susceptible to the Ring's promises of power, as in Frodo and Samwise Gamgee, who are able to handle the Ring for extended periods of time.
Except for Tom Bombadil, nobody seemed to be immune to the corrupting effects of the One Ring, even powerful beings like Gandalf and Galadriel, who refused to wield it out of the knowledge that they would become like Sauron himself.