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.
The Hobbit: The Desolation of Smaug
Some characters in the film are not in the novel, but created for the film. Legolas appears in Tolkien's "Lord of the Rings" trilogy, but not in the novel "The Hobbit". 
Additionally, Peter Jackson makes a cameo appearance in the film, reprising his role as the man eating a carrot in Bree, his daughter Katie portrays Barliman Butterbur's wife Betsy, Philippa Boyens's daughter Phoebe and scale double Kiran Shah appear as a waitress and a Hobbit in the Prancing Pony, James Nesbitt's daughters Peggy and Mary portray Tilda and Sigrid, the daughters of Bard, Stephen Colbert and his family along with WingNut Films' assistant Norman Kali and producer Zane Weiner appear as Lake-town spies, and editor Jabez Olssen appears as a fishmonger. Brian Sergent (who portrayed the Hobbit Ted Sandyman in the extended edition of Fellowship of the Ring) and Peter Vere-Jones provide the voices of the spiders in Mirkwood.