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.
Ungoliant
Ungoliant is a fictional character in J. R. R. Tolkien's legendarium, described as an evil spirit in the form of a spider. She is mentioned briefly in "The Lord of the Rings", and plays a supporting role in "The Silmarillion". Her origins are unclear, as Tolkien's writings do not explicitly reveal her nature, other than that she is from "before the world". She is one of a few instances, along with Tom Bombadil and the Cats of Queen Berúthiel, where Tolkien does not provide a clear background for an element of his fiction.