Thuringwethil
Maiar
Created by Eru. Deathless.
Thuringwethil
by Varda-(Valar)
Thuringwethil is Sindarin for "Woman of secret
shadow".
Vampiric Maia woman, whose likeness Luthien stole
for a time by taking her bat fell (skin).
Messenger of Sauron.
Reference: Silmarillion