Sting was an elvish sword used by Bilbo Baggins and his heir Frodo Baggins, Forged in the First Age in Gondolin, it’s purpose in battle was a dagger, but to a small hobbit it made an excellent short sword. It glows silver, blue on the edges, when goblins and orcs are nearby, which is a quality of First Age Elvish swords. It’s use during the Fall of Gondolin is unknown, but it was found by Thorin’s Company on their Quest to Erebor. Following the encounter and defeat of the trolls the Company found their hoard which held numerous treasures. Bilbo took the sword as he was unarmed at the time, and clearly underestimated the danger of the quest. Throughout his quest he kept it in his breeches, it is described as a plain sword with a leather sheath. It was used to intimidate Gollum for escape from the Misty Mountains, but it wasn’t until the dwarves were captured by the Giant Spiders of Mirkwood that Bilbo baptized the blade in blood. The “sting” of his sword upon the spiders is what prompted it’s name. The sword served Bilbo throughout his quest, and he brought it home to the Shire and ultimately Rivendell. There it was passed unto his heir Frodo Baggins, for his Quest of the Ring. Frodo used it extensively in the Mines of Moria and the Taming of Smeagol. It was able to cut the webs of Shelob, which is significant as they were immune to the barrow blade of Samwise. When Frodo was captured by the orcs of the Tower of Cirith Ungol, the sword passed to Samwise Gamgee, who took it from the “dead” Frodo. Wielded by Sam, Sting helped Samwise storm the Tower, save Frodo, and they finished the quest. Sting was given to Samwise as Frodo went to the Undying Lands, It became an heirloom of Sam’s family.
“Somehow the killing of the giant spider, all alone by himself in the dark without the help of the wizard or the dwarves or of anyone else, made a great difference to Mr. Baggins. He felt a different person, and much fiercer and bolder in spite of an empty stomach, as he wiped his sword on the grass and put it back into its sheath. ‘I will give you a name,’ he said to it, ‘and I shall call you Sting.’” – Bilbo showing his Tookish side, The Hobbit, Spiders and Flies.