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.
Sigurd the Stout
The sources for Sigurd's life are almost exclusively Norse sagas, none of which were written down at the time of the events they record. The "Orkneyinga Saga" was first compiled in Iceland in the early 13th century and much of the information it contains is "hard to corroborate". Sigurd also appears briefly in "St Olaf's Saga" as incorporated into the "Heimskringla" and in the "Eyrbyggja Saga". There are various tales about his exploits in the more fanciful "Njal's Saga" as well as the "Saga of Gunnlaugr Serpent-Tongue", "Thorstein Sidu-Hallsson's Saga", the "Vatnsdæla Saga" and in the tale of "Helgi and Wolf" in the "Flateyjarbók.