A record of crafting techniques left by an armorer who served the great general Radahn. Contains knowledge of dealing with rot; the application of fire in particular. Acquire the knowledge to craft the following: – Preserving Boluses
Where to Find the Armor’s Cookbook 
You can find the Armorer’s Cookbook  west of the Siofra River Bank site of grace in the Siofra River dungeon, located in Limgrave.