Sting (Middle-earth)
Sting has the magical ability to detect orcs or goblins nearby, glowing blue in their presence, as it did when the Fellowship encountered orcs in the mines of Moria. Tolkien establishes this as a common property of First Age Elf blades, particularly those forged in Gondolin. Sting is also exceptionally sharp. Bilbo manages to thrust it without effort deep into a wooden beam at Rivendell. Frodo also wounds a troll in Moria, after Boromir notches his own sword with his attempt. Sam uses Sting to cut through the giant spider Shelob's strong webs with ease, and also wound the spider, driving it away from the paralyzed Frodo.
Mithril
Mithril is a fictional metal found in the writings of J. R. R. Tolkien, which is present in his Middle-earth, and also appears in many other works of derivative fantasy. It is described as resembling silver but being stronger and lighter than steel. The author first wrote of it in "The Lord of the Rings", and it is retrospectively mentioned in the third, revised edition of "The Hobbit" in 1966. In the first 1937 edition, the mail shirt given to Bilbo Baggins is described as being made of "silvered steel".