A book that increases the effectiveness of your trainers. "This book will teach your trainers to increase block by an additional 5%!"

First appears zone 5 cell 10. Reappears every 5 zones.

Initial Cost: 1000 Science, 2000 Food, 3000 Wood, 2000 Metal.

After x upgrades, each trainer will increase block by 20%+5%*x.