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The Nomadic Warrior's Cookbook 5 is one of the many Key Items found throughout Elden Ring, sold by the Mistwood Nomadic Merchant in West Limgrave.
The Nomadic Warrior's Cookbook 1 is a Key Item Recipe Book that will unlock extra crafting recipes once you have obtained it.
This includes the following recipes:
Purchased From: Nomadic Merchant south of the Minor Erdtree in the Mistwood of East Limgrave. It can be bought for 1,500 Runes.