Rules

The Ring's primary power was control over the other rings, including "mastery over [their] powers" and domination of the wills of their users. However, its effectiveness in this manner proved limited, as the wielders of the Three never used them while Sauron held the One, and the Dwarves to whom the Seven had been given proved too tough for Sauron's mental influence to take hold. By extension, the Ring also conferred the power to dominate the wills of other beings whether they were wearing Rings or not. However, this is its least accessible power, since it granted this ability in proportion to the user's natural capacity. Perhaps most usefully, the Ring was capable of augmenting the abilities and powers of whatever being held it. Also, the wielder of the One Ring might not have possessed most if not all the powers of the Ring. Only Sauron or someone similar in power and experience with the ring would be able to wield its full power. Varying powers or effects of the Ring are seen in the wielder depending on their power, skill, abilities, natural capacity, and situation. When Samwise Gamgee held the Ring he could hear far better and with more acute accuracy while trying to sneak around Cirith Ungol to evade the orcs and save Frodo. Frodo was able to see for miles when wearing it.