The Armorer's Manual (4) is a cookbook in Elden Ring. Cookbooks are records of crafting techniques that players can use to learn how to make a wide variety of items. Let's take a look at where to find the Armorer's Manual (4) and how to use it.
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Key items are used for quests, to unlock places, to learn spells or crafting recipes.
Image from the Armorer's Handbook (4) in Elden Ring:

Descriptions from the Gunsmith's Manual (4):
Treaty of artisanal techniques abandoned by a gunsmith who served under the great general Radahn.
There are tips for fighting putrefaction, especially through the application of fire.
Teaches crafting of the following item:
Item name in English: «Armorers cookbook (4)»
Locations of the Gunsmith's Manual (4). Where to find the Gunsmith's Manual (4) in Elden Ring.
The Armorer's Manual (4) can be found in Redmane Castle, in the house by the west gate.
How to use the Gunsmith Manual (4) in Elden Ring?
The Armorer's Manual (4) provides the knowledge necessary to craft the following item:
Additional information about the Gunsmith's Manual (4)
- If you have already activated Radahn's Festival, the door to the house will be locked, and you will need to defeat the Radahn Starblight and exhaust Jerren's dialogue to get him to leave the castle in order to open it again.
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