How to get the Book of Knowledge in Clogher in AC Valhalla
- Enter the Clogher Regin from the Western side.
- You will find a well-hidden breakable wall behind the house on the left.
- Use a nearby red jar to blow up the door.
- Go inside of the cave and pull a big moveable stone with handles on it, to make enough room for Eivor to slip through.
- Slide inside the hole to find The Book of Knowledge.