Ungoliant is a fictional character from J.R.R. Tolkien's legendarium, primarily featured in "The Silmarillion." She is depicted as a monstrous spider-like creature, born from darkness and associated with insatiable hunger. Ungoliant is known for her ability to consume light, which she uses to devour the light of the Two Trees of Valinor. In the story, Ungoliant allies with Melkor, the dark lord, to steal the light of the trees. After their alliance, she becomes increasingly uncontrollable and ultimately turns against Melkor. Ungoliant's legacy continues through her offspring, including Shelob, a significant character in "The Lord of the Rings."