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“Protect yourself from the dangers of the Wasteland. If you're the sort to tinkerer at an armor workbench and want to craft some impressively protective gear for yourself or your companions, choose this perk.”— Fallout 4 Vault Dweller's Survival Guide description
You can now craft advanced armor mods. (Plans required)
Crafting armor now costs fewer materials.
Your crafted armor has improved durability.
Fallout: The Board Game
After being obtained, this card can be discarded at a town to gain any apparel from the shop or discard piles.
In Fallout 4, the perk is needed to craft mods from scratch, not for applying or removing mods. It is possible to remove an uncraftable mod and apply it freely on a different piece of the same kind of armor.