Hidden Ones Set
- Increase Assassination Damage when crouched and undetected for 10s
- Additional increase to Headshot Damage
The Location of all 5 Armor Pieces
Hidden Ones' Gloves
Ledecestre - Ledecestrescire - Mercia
Go to the Armour spot. There is a big Assassin's sign on the floor.
There, look around for a big hanging bag that you can shoot down.
Do so and it will open a passage down.
Follow the slide-through gaps in the walls to get into the Hidden One's Office, where this item is.
Hidden Ones' Hood
Camulogunum Bureau - Colcestre - Essexe
This chest is in the Hidden Ones' Bureau in Colcestre.
First find the entrance. It's a weak wall / stone barricade near a tilted statue.
You can get an oil jar nearby to throw down and climb down.
Follow the corridor down. At some stage you can climb up and you end up in a big flooded area.
The entrance door is barred. There are two exit points over your head. The one to the left (with the bureau door in your back), leads to another barred door.
Climb up to the exit on your left though. Once you're up, look to the other side of the flooded entrance area.
There is another passage. Parcour over.
Down here is a locked door with a pool.
Dive down to get the key.
Once you've opened that door, you can get to a window where you can shoot at one of the barred doors that lead into the inside.
Do that and you can go get your Hidden Ones Hood
Hidden Ones' Mask
Londinium Bureau, Lunden
Go to the Londinium Bureau Office location on the map.
You will see high branches in a circle that you can't penetrate.
Climb high up and take a dive from a branch above the map marker to dive into the Londinium Bureau.
Here, you can dive underwater to get behind the locked office.
Near the hanging platform, shoot the oil jar to get inside the office.
Hidden Ones' Robes
Eboracum Bureau, Jorvik
In the most southern part of Jorvik at the border to Eurvicscire is the Secret Entrance for the Eboracum Hidden One's Bureau (see map).
Climb down and dive through to the other side where you will find a big area with a flooded pool again.
With the crack in the wall - that you came from - in your back, swim all the way to the back right corner of the pool.
Here you can dive and use a passage underwater to get to the other side.
Here you can access the bureau.
There is a chest with a lock and a locked door.
The key for the locked door is on top of the shelf with the many documents next to the locked door.
Unlock the door and loot the chest.