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In order for you to learn the recipe and see the require ingredients for your item, you need the blacksmith to assist you. Open your map by pressing M on your keyboard and then look for the hammer sign in the city. Go to that location to find the NPC. Alternatively, you can use the auto-navigate by clicking on the NPC named Knight Blacksmith Analisa in the list and then hit the boot sign to move. When you've talked to her, choose "I want precise casting and forging." This will open up a new window where you get to learn or craft the items listed there. Open your inventory and then click, hold, and drag the Fusion Formula and drop it in the Special Recipe slot. Click the "Learn" button to register the Fusion Formula in the list. After learning the recipe, click on the name Turin's Executioners to see the items you need.
Look for the blacksmith. Talk to the blacksmith.