There’s a book of knowledge in Threaded Pass in Eurvicscire of Assassin’s Creed Valhalla.
This book will grant the ability of Kick of Tyr.
Here’s how you can get the book of knowledge in Threaded Pass in AC Valhalla.
To begin, get to the location shown in the map below, marked by the book symbol.
When you enter Threaded Pass, you will encounter many enemies. A good way to deal with them is to start a raid.
How to get the book of knowledge
Before getting to the book’s location, you need to find a key first.
Climb on the highest tower in the area which has a zipline.
Use the zipline and stop at the next platform.
You will be able to get a key here.
Then, head to the house which contains a staircase going underground.
You will reach a locked door.
Use the key from earlier to enter the room.
Take the book and you’ll get the Kick of Tyr ability.