The Palantiri, also known as the Seven Seeing Stones of Middle Earth, were created by the Numenoreans as a way to communicate telepathically across their kingdoms, and as a way to watch over the past, the present, and the future. It allowed them to build vast and great lands, keep their people safe, and predict the plans of their enemies and usurpers. But in the wrong hands, the Palantiri become dangerous weapons, used to corrupt and break the minds of those who wield them. Sauron is able to gain access to and control the Palantir in Minas Ithil, when he takes the fortress and turns it into Minas Morgul. In doing so, he is linked to all the other Palantir in existence.
This is how he is able to corrupt Saruman the White, when Saruman begins using the Palantir to try to predict Sauron’s plans and learn about the rings of power after Galadriel banishes the dark lord on Dol Guldur. The Palantir is also how Sauron begins to influence and derange Denethor, the Steward of Gondor, in order to weaken the bond between the kingdoms opposing him. Through Denethor, he is able to make the kingdoms squabble among themselves rather than uniting in the common cause of defeating him and the hoard of orcs that he is amassing behind the Black Gates in Mordor.
LOTR: Why Does Theoden Ignore Gandalf's Advice?
There is at least three confirmed locations for the Palantir in the Lord of the Rings films. These include the aforementioned Minas Morgul, Minas Tirith, and Orthanc in Isengard. However, fans has spotted another of the seven stones hidden in the background of one of the scenes in The Hobbit trilogy.
At one point, Gandalf ventures to the fortress of Dol Guldur to learn the whereabouts and the fate of Thrain, Thorin’s father. When he first
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