# Mystery Key > [!info] Item Details > | | | > |---|---| > | **Category** | Wondrous Items | > | **Rarity** | Common | > | **Attunement** | No | > | **Source** | XGtE p.138 | --- ## Description A question mark is worked into the head of this key. The key has a 5 percent chance of opening any lock into which it's inserted. Once it opens a lock, the key disappears. --- ## Properties - Has a **5% chance** (roll a d20, success on a 20) of opening any lock it's inserted into. - **Disappears** after successfully opening a lock. - No attunement required.