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The Nomadic Warrior's Cookbook 12 is one of the many Key Items found throughout Elden Ring, located at the Rose Church in North Liurnia.
The Nomadic Warrior's Cookbook 12 is a Key Item Recipe Book that will unlock extra crafting recipes once you have obtained it.
This includes the following recipes:
Found at the Rose Church directly south of the Academy of Raya Lucaria in North Liurnia, guarded by a Sanguine Noble.