Anti-Skeleton Key

/u/unimportanthero

This simple iron key has been crafted to resemble a skeleton hand clutching an iron ring, with the arm itself turning into the actual blade of the key. It was created when an apprentice enchanter made a few critical but lucky errors when making a skeleton key and has changed many hands since its creation. Its enchantment is simple: It can be inserted into any lock and, when turned, it locks the lock. A lock that has been locked by the Anti-Skeleton Key cannot be picked, and can only be opened by the mundane key it matches or a magical spell such as Knock.