Assassin’s Creed Valhalla Siege of Paris Diodurum Ruins Roman Excavation Mystery Guide

A complete collection of Assassin’s Creed Valhalla guides for the trickiest World Events, Mysteries, Collectibles, and more—everything you need to know about the latest Assassin’s Creed video game. AC Valhalla is a 2020 action role-playing video game developed by Ubisoft Montreal and published by Ubisoft.

The game was released on November 10, 2020, for PC, PlayStation 4, Xbox One, Xbox Series X and Series S, and Stadia, while the PlayStation 5 version was released on November 12. It was followed by Assassin’s Creed Mirage, released on October 5, 2023.

World Events (Mysteries):

Offering Altars: 

Flyting Duels:

Roman Artifacts:

Books Of Knowledge:

Fly Agarics Mysteries: 

Hoard Map Treasures:

Gear Locations:

Ingot Locations:

Tips & Tricks: 

Ostara Festival Guides:

Wrath of the Druids DLC Guides:

Sigrblot Festival Guides:

Siege Of Paris DLC Guides:

Crossover Stories DLC Guides:

Dawn Of Ragnarok DLC Guides:

Updated November 9, 2023

Diodurum Ruins Roman Excavation is one of the Assassin’s Creed Valhalla Melunois Mysteries you’ll need to complete in the first Siege of Paris DLC area.

The AC Valhalla Diodurum Ruins Roman Excavation activity we’ll cover in the guide below allows you to collect the Diodurum Key, which you’ll use to open the door to the Hidden Ones’ Bureau in Paris.

The Roman Excavation Mystery in Diodurum Ruins is in the same place as the Diodurum Ruins Fast Travel point; you’ll need to synchronize. As you can see on my map, you can find it in the northern section of Melunois, just north of Chartres Church.

AC Valhalla Diodurum Ruins Roman Excavation Location

How To Complete the Diodurum Ruins Excavation Mystery

As said, to finish this Mystery, your goal is to find and collect the Diodurum Key, which happens to be in the same room where you can find the Golden Flame Ability or the Book of Knowledge. So basically, if you reach the location of the Ability, you’ll also find the Key.

This means you’ll use the same method to get inside and start by performing a Leap of Faith in the pond under the High Point after you synchronize it. Next, you’ll need to dive and follow the underwater tunnel, which leads to a dead-end.

From there, you’ll swim up and enter a new tunnel where you’ll see the Hidden Ones’ logo on a stone door. Interact with it, and in the next room, you’ll see a gap filled with water. Jump, then swim right, following a new underwater tunnel.

You’ll need to take two left turns to reach a new dead-end and swim into a room with a breakable wall like the one in my screenshot. Here, turn around to spot a red jar you can throw to destroy the wall.

AC Valhalla Diodurum Ruins Wealth Location

Behind the wall above, you’ll find the room where the Wealth awaits you. Once inside, turn right, and you’ll spot the table below and the Diodurum Key on it.

AC Valhalla Diodurum Key Location

After getting the Key, the Melunois Roman Excavation Mystery ends; however, you’ll notice that you’ll start a new quest.

How To Use AC Valhalla Diodurum Key

If this is your first Key, you should know you won’t be able to use it immediately because you’ll need the other two. Basically, the Diodurum Key, the one from Amienois and the one from Evresin, allows you to enter the Assassin Bureau in Paris, which is your objective for the Hidden main quest.

Until then, your next goal is to exit the ruins, which is extremely easy through the door on the left. If you encounter difficulties, simply follow the same path as the one outlined at the end of my guide on how to get the Diodurum Ruins Ability.

A complete collection of Assassin’s Creed Valhalla guides for the trickiest World Events, Mysteries, Collectibles, and more—everything you need to know about the latest Assassin’s Creed video game. AC Valhalla is a 2020 action role-playing video game developed by Ubisoft Montreal and published by Ubisoft.

The game was released on November 10, 2020, for PC, PlayStation 4, Xbox One, Xbox Series X and Series S, and Stadia, while the PlayStation 5 version was released on November 12. It was followed by Assassin’s Creed Mirage, released on October 5, 2023.

World Events (Mysteries):

Offering Altars: 

Flyting Duels:

Roman Artifacts:

Books Of Knowledge:

Fly Agarics Mysteries: 

Hoard Map Treasures:

Gear Locations:

Ingot Locations:

Tips & Tricks: 

Ostara Festival Guides:

Wrath of the Druids DLC Guides:

Sigrblot Festival Guides:

Siege Of Paris DLC Guides:

Crossover Stories DLC Guides:

Dawn Of Ragnarok DLC Guides:

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Vlad Susanu
Written by
Vlad Susanu

Founder and Senior Content Producer at GameClubz, Vlad is the former CEO of VGFAQ.com and Primewikis.com. He's been playing video games since 1994 and likes keeping up with the latest releases, increasing his collection of PlayStation trophies daily.

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