Item from A Court of Thorns and Roses by Sarah J. Maas
Azriel's legendary blade — a knife of dark metal that can cut through magical wards and is one of only two Illyrian blades of its kind.
Truth-Teller is a blade that seems to drink light. Forged from a dark metal that predates current Fae smithing knowledge, it's been Azriel's signature weapon for centuries — used in interrogations, assassinations, and the quiet work that keeps the Night Court safe. The knife can cut through magical barriers and wards that would stop conventional weapons, making it invaluable against enchanted defenses. Its twin blade is Gwydion, a legendary sword lost to history. Together they were forged in a time before the courts existed. Azriel lending Truth-Teller to someone is one of the most significant gestures of trust he can make — he's done it exactly once.
Also known as: Truth-Teller, Azriel's blade, the shadow blade