An expert with your chosen tools, you can subtly alter an item’s final form. You gain the following benefits.
Ability Score Increase. Increase an Ability Score by 1, to a maximum of 20.
Experienced Crafter. When you make a Manufacturing check with a tool with which you are proficient, your Proficiency Bonus is doubled.
Hammering Out. When you forge an item and roll for enchanting and/or manufacturing quirks, you can apply a bonus or penalty to the result of the roll equal to half your Proficiency Bonus.
Craftsman. Each hour you spend forging an item counts as 2 hours towards the item’s completion.