Eventually the splinters become as small as the Phial of Galadriel, which she had filled with light gathered from her fountain as it refracted the light of the Star of Eärendil. The Phial enables Frodo and Sam to defeat the giant spider Shelob, descendant of Ungoliant, on their way to Mordor to destroy the Ring, which contains the power of Sauron, the remaining servant of Melkor on Middle-earth.