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The Ancient Dragon Apostle's Cookbook 1 is one of the many Key Items found throughout Elden Ring, found at the Wyndham Catacombs in Mt Gelmir.
The Ancient Dragon Apostle'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:
This item can be found in the Wyndham Catacombs located behind the Wyndham Ruins at the border of the Altus Plateau and Mt Gelmir's south side.