You will meet a man named Hytham early on in Assassin's Creed Valhalla as he is a member of the Hidden Ones. When you build him a hut at your settlement then he will task you with acquiring both medallions from the members of the Order of the Ancients, as well as Codex Pages. These pages can be found in abandoned Hidden Ones' Bureaus across the map in England, and players will also acquire a piece of the Hidden Ones' armor as well.
There are six bureaus in all and it can take quite a bit of exploring to find them all on your own. Unfortunately, discovering these locations on your map is easier than actually finding a way into the bureau itself. Finishing this side quest for Hytham will also unlock an Assassin's Creed Easter egg which is why you should strive to finish this early!
Ratae Bureau
Location: Ledecestre, Ledecestrescire
This is the first Codex Page that you will probably come across in the game due to the low level of this region. It is found in the northwest part of this location and you want to start by climbing the pillars over where the gear marking shows on the map near this bureau.
There will be a brotherhood logo in the middle of it and if you look across the way you will see a broken building and a bag of hanging rocks. Shoot them down with an arrow from your light bow then jump into the hole they create and follow it to the end to collect your prizes.
Rewards
- Hidden Ones' Gloves
- Codex Page
Eboracum Bureau
Location: Jorvik
The southernmost part of this city is where you will find the Eboracum Bureau. There will be a little girl here who is talking about some ghosts she has been hearing. When you question her about it she will show you where she has been hearing them, and you will come across a breakable wood covering on the ground.
One tip before playing is that you will want to jump into this hole and then dive into the water, where you will swim until you reach an opening. Once you reach an open room there will be a few chests to loot, two keys to find, and some movable objects that will grant you access to this bureau and its treasures.
Rewards
- Hidden Ones' Robe
- Codex Page
Londinium Bureau
Location: Lunden
The Londinium Bureau is found on the outskirts of the city to the northeast and you will want to look for some ruins in this area. There will be a large circular stick structure that you will have to climb and use the surrounding pillars to your advantage, which is something only pro players usually know how to do.
Then you will need to dive into the water below, which turns out to be a pool. A breakable wall can be found under the water, but it can be hard to see so use Odin's Sight if you are having trouble finding it. Finally, just climb up onto the platform and ropes, shoot the red barrels through the window, and you will be able to collect your rewards.
Rewards
- Hidden Ones' Mask
- Codex Page
Venta Belgarum
Location: Wincestre
If you head to the middle of Wincestre and then head to the west, just south of St. Paul's Church, then you will discover the Venta Belgarum Bureau. You will notice a few pillars with a square opening in the middle that you will have to drop down into.
Next, you will want to dive into the water and follow the caverns until you are behind the locked door. There will be a breakable rock wall you will have to destroy in order to gain access to this bureau, and this Codex Page is one many go for after they beat the game.
Rewards
- Suttungr's Claw
- Codex Page
Camulodunum Bureau
Location: Coclestre, Essexe
The Camulodunum Bureau is found in the southern portion of Colcestre, which is a city with one of the best storylines, and is marked by a secret entrance on the map. It is between the market and a heavily guarded area and is marked by a breakable rock entrance in the ground.
You will need to jump down into the hole and follow the passageways until you reach a barred door. There are hidden rooms you can find by swimming under the water and climbing through the openings at the top of the walls. The final step is to shoot the lock off the door when you find your way to the other side of it in order to gain access to this room.
Rewards
- Hidden Ones' Hood
- Codex Page
Temple of Ceres Bureau
Location: Forest of Denu, Glowecestrescire
If you head a few paces west of the Forest of Denu then you will discover the Temple of Ceres Bureau, but you might want to make an overpowered character before heading to this region. There are tall statues of guards at the above-ground entrance with a temple that you will need to enter.
You will want to follow the stairs leading underground, but be wary of the green poisonous gas in the rooms. Make sure to equip your torch as a simple toss will cause it to disintegrate, which is one of the best things about the game. From here it is pretty straightforward as you make your way through the rooms destroying the gas until you reach the gear chest and the final codex page.
Rewards
- Hidden Ones' Leggings
- Codex Page