The “Lord of the Rings” and “The Hobbit” stories take place roughly a millennium after the Balrog emerges. By that time, mithril has achieved a nearly mythic status, and there are still quite a few famous objects in existence that are made of the miracle metal. Of course, there’s Bilbo’s corslet, but there’s more.
Galadriel’s Ring of Power,, is made of Moria-silver. It’s also used in , the glowing letters used to write on the secret doors of Moria. The guards of Minas Tirith have mithril incorporated into their helmets, which are referred to as “heirlooms from the glory of old days” in “The Return of the King” book. In the printed version of the story, it also says that one of Aragorn’s ancient family heirlooms called is set in a mithril fillet. Arwen makes a banner for her future husband with mithril woven into the image, as well. After the War of the Ring, Gimli even returns to Minas Tirith, where he rebuilds the gates using a combination of mithril and steel. The last place where mithril can be found in “The Lord of the Rings” is in the Land of Shadow itself. In “The Fellowship of the Ring,” Gandalf explains the fate of the mithril left behind when the Dwarves vacate Moria, saying that “Of what they brought to light the Orcs have gathered nearly all, and given it in tribute to Sauron, who covets it.”
From gates to armor, rings to banners, Balrogs to the Dark Lord’s coffers, mithril plays a critical role throughout Middle-earth history. From what we’ve seen, it’s going to impact “The Lord of the Rings: The Rings of Power” story both for better and very much so for worse.