God of the Forge (5e Feat)
From D&D Wiki
God of the Forge
Prerequisites: Master Blacksmith Feat
You have joined the highest tier of blacksmiths in the world and even other realms, and gain the following benefits:
You have a +2 to all Smith's Tools checks.
When you craft an item and get a 35 or higher on the check, you can make it a +4 item so long as it is not armor.
When mining or looking for materials to craft weapons and armor, you see exactly where to hit and where to look to get as much as possible, causing you to find twice as much material on a successful check to mine or find it.