This Book of Knowledge though is inside the Oxeneforda Crypt and as you can guess, it requires a key.
The key in question is our topic, and I am going to explain where to find it.
Assassin’s Creed Valhalla Oxeneforda Ability Location
On the map below you can see that this ability is found on the northern side of the Oxeneforda village, very close to the gear we have covered earlier.
If you zoom in though, you’ll notice that in fact there are two buildings, and they are independent.
The gear is inside a tower, but the ability is inside the Oxeneforda Crypt. Which as said required a key.
How To Get Enter Oxeneforda Crypt In AC Valhalla
Good, so let’s go get the key.
When you are close to the Crypt, just across the street you’ll see the tower where you found the gear, and to get inside we will use the same tactics.
Look at the colored windows on the first floor and shoot one of them, then climb inside the tower.
Now, instead of going up to the second floor, you’ll want to go down, but the path is blocked by another shelf. You can see it in the following picture.
Pull this shelf back and you’ll find a hatch and a ladder.
Follow the ladder down, and the Oxeneforda Crypt Key will be located on a desk under a large cross.
Take the key, then exit the tower through the front door, by destroying the red locker.
Now, go left, and open the crypt you can see in my screenshot.
The Book of Knowledge is right in front of you.
That’s how you get the Assassin’s Creed Valhalla Ability inside Oxeneforda Crypt in Oxenefordscire, but now maybe you should focus on the one inside Sancta Helena’s Church.