Scavenger Hunt: Wolf School Gear Upgrade Diagrams - Part 4
Treasure hunt
Kaer Morhen 
On the world map
From the journal
Geralt happened across a map which contained markings showing the locations of caches of old Wolf School witcher diagrams. He set out to find them in hopes of improving his equipment.
Geralt found all the caches which were marked on the map. He had a suspicion there might be more such caches to be found.