There are different keys you need to find to get all the rewards and information from the Hidden Ones bureau in France. One of the keys is inside the Diodurum Ruins. In this guide, we will discuss everything you need to know on how to find the Diodurum Ruins Key in AC Valhalla.
AC Valhalla Diodurum Ruins Key Location
Head over to the Diodurum Ruins and locate the wooden floor. Breakthrough the floor to drop down in the lower section. However, don’t just drop down yet. Jump into the body of water under the sync point.
There is a doorway arc in the water where you need to swim down into the water to reach the hidden room. When inside the next room, go into the water and follow the pathway down to reach a dead end.
Grab the explosive red pot and throw it at the stone wall to create a path for Eivor. In the room, you will be the ability to get the Diodurum Ruins key and another Book of Knowledge that grants you the Golden Flame ability.
With this new ability you will be able to attach an explosive to an enemy and the explosive explodes after a short delay.