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Simply buying items from merchants can be prohibitively expensive. It can be much cheaper to create items by purchasing diagrams that show how they’re constructed, gathering up the materials, and then paying a craftsman to make the item for you. Of course, not every item has a diagram, and some diagrams are difficult to obtain. On the other hand, almost all of the best equipment in the game can only be manufactured from a diagram with the right materials.

Most diagrams can either be found as loot or purchased from a merchant. You can obtain diagrams for basically any sort of item that isn’t made primarily through alchemy. This includes equipment, consumables like traps, enhancements, and (recursively) certain common crafting materials like oil. Once you have a diagram you want to manufacture, make sure you have the materials required to craft it.

While there are certain items in the game like oil and leather that are used only in crafting, basically anything in the game can end up being required to craft a diagram. This includes many monster drops, certain runes, and in rare cases, even full pieces of equipment. Most item diagrams call for a blend of common and rarer items.