This ability is located beneath the Ruined Tower synchronization point. You’ll likely need to battle the bandits outside before you can make your way into the tower. You can then either shoot the covered hole in the ground, or use a fire pot. Jump down into the hole and then use the fire pots to explode the breakable wall blocking your way. Behind the wall, you’ll find the Book of Knowledge, Blinding Rush.
This ability is located within a ruined church east of King’s Bury. When you reach the church, head inside and climb up to the higher platform. Here, you will find the Book of Knowledge for Axe Blizzard. You’ll go to King’s Bury during the Raising Iron main story quest.
Rush & Bash
You can grab this Book of Knowledge from Dunwic Fortress. You go to Dunwic Fortress during the Triumphant Return main story quest. You’ll need to grab the key found behind the Woe-Bringer enemy, then head down into the secret tunnel nearby where you found the key. You can then use the key to unlock the room underground where you’ll find the second Rush and Bash book. If you already have the first Rush and Bash ability then you will get an upgrade to the ability.