Thuringwethil was Sauron's herald and was stationed at Tol-in-Gaurhoth by the time of the Quest for the Silmaril. She was probably slain or died during the fight between Sauron and Huan in the fortress.
She served as a herald, or a messenger, for Sauron at Tol-Sirion. Her origins were not mentioned, but her ability to take forms suggest that she could be a Maia. She was described to have fingered-wings and iron claws. Lúthien was disguised as Thuringwethil and introduced herself as such upon infiltrating Angband.
'Thuringwethil I am, who cast
a shadow o'er the face aghast
of the sallow moon in the doomed land
of shivering Beleriand.'
- ↑ The Silmarillion, Quenta Silmarillion, Chapter XIX: "Of Beren and Lúthien"
- ↑ The History of Middle-earth, Vol. 3: The Lays of Beleriand, III: "The Lay of Leithian"
- ↑ The Silmarillion, Index of Names
- ↑ The Silmarillion, Appendix: Elements in Quenya and Sindarin names