Tarnished coin

The Dark Man left this coin for Vanya along with a letter. The letter said that if Vanya took Rose's ring, he should whisper her name into the coin and the Dark Man would know.
Vanya originally didn't tell Rose about the coin--he was on his way to Falkovnia, so it seemed like a moot point. In Ludzig's wine cellar, however, he was sorely tempted to use the coin to make a deal and escape, so he decided that he couldn't be trusted with it anymore. When he got back to Mordent, he immediately gave it to Rose and told her everything.
You found an identical coin in Sofia Albescu's room when you searched her house.

Current Holder

Rose