The Old Key is a unique item you can get right near the start of Expedition 33, but what is it for? In this Clair Obscure guide, we tell you where to use the key so you can discover some exciting secrets of the Expeditions of yesterday.

To use the Old Key, you need to follow the main story until toward the final stages of the game. Eventually, you will visit Old Lumiere. Once you reach Old Lumiere, follow the pathway and the story until you reach the specific location shown above.
Once you reach that point, take a right and run toward the ledge.

When you reach the ledge, you will see a damage stone structure protruding from below. Jump on and follow the structure until the broken part in the middle. Jump down into the structure below.

You will then find an old grate door. Use the Old Key to open the door and gain access.
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