Assassin’s Creed Valhalla Hidden Side Mission Guide

In the Siege of Paris DLC for Assassin’s Creed Valhalla there’s a special Hidden side mission players can complete. This side mission tasks you with finding three keys to open a special locked door. To help you complete this mission we’ve put together a brief guide. See the Assassin’s Creed Valhalla Hidden side mission guide below for details.

How to Open Locked Door in Paris

To complete the Hidden mission you need to find three keys that are hidden throughout Francia. These three keys open a locked door located in the Lutetia Bureau named area of Paris. At this location there is a locked door leading to the assassin’s bureau. You will have an active mission called Hidden when you need to visit this location.

Hidden Key Locations Map

The door is unlocked with three keys hidden in three ruins. The locations of each of the three keys are on the map below. To find the keys go the the marked locations. The locations are as follows:

  1. Champlieu Ruins.
  2. Diodurum Ruins.
  3. Gisacum Ruins.

In each of the ruins above there is a marked assassin door. Going through these doors lead to rooms that have the keys inside. Approach the keys and grab them to add them to your inventory.

What’s in the Assassin’s Bureau

Once you have all three of keys return to the locked door. Enter the large area to unlock the Future Past trophy/achievement. Alongside this achievement the room itself contains the special Joyeuse short sword. Upon acquiring the sword leave the bureau to find a special letter. This ends the quest.

Thoughts on our Assassin’s Creed Valhalla Hidden side mission guide? Drop them in the comments below.

Eli McLean

Eli "Enricofairme" McLean is the Founder and lead writer on holdtoreset.com. He has been creating content about video games for the past 5 years. You can follow Eli on Twitter @enricofairme.

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