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I know Nenya [...] granted Galadriel power over waters and mists.
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How do you know that?
In any event what we know of Vilya's powers are:
"The chief power (of all the rings alike) was the prevention or slowing of decay (i.e. 'change' viewed as a regrettable thing), the preservation of what is desired or loved, or its semblance - this is more or less an Elvish motive. But also they enhanced the natural powers of a possessor - thus approaching 'magic', a motive easily corruptible into evil, a lust for domination."
Letter 131
"`The Three were not made by Sauron, nor did he ever touch them. But of them it is not permitted to speak. So much only in this hour of doubt I may now say. They are not idle. But they were not made as weapons of war or conquest: that is not their power. Those who made them did not desire strength or domination or hoarded wealth, but understanding, making, and healing, to preserve all things unstained. These things the Elves of Middle-earth have in some measure gained, though with sorrow."
Elrond speaking in FotR, Council of Elrond
"Now these were the Three that had last been made, and they possessed the greatest powers. Narya, Nenya, and Vilya, they were named, the Rings of Fire, and of Water, and of Air, set with ruby and adamant and sapphire; and of all the Elven-rings Sauron most desired to possess them, for those who had them in their keeping could ward off the decays of time and postpone the weariness of the world."
The Silmarillion, Of The Rings Of Power