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.

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