Gun Blueprint is a hardmode crafting item,

Crafting

Crafting Station
Necromaniac Workbench.pngNecromaniac Workbench
Ingredient(s) Amount
Torn Papyrus.png Torn Papyrus 1
Result
Gun Blueprint.png Gun Blueprint 1

Used in

Crafting Station
Necromaniac Workbench.pngNecromaniac Workbench
Ingredient(s) Amount
Gun Blueprint.png Gun Blueprint 1
Result
Rupicide Cannon.png Rupicide Cannon 1
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