Alloy Forge
Melts metals and catalysts together into named alloys.
Updated
Getting one
Craft it at a crafting table, then place it on the ground.
Alloy Forge
Crafting TableRequires: None
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Using it
Right-click it without sneaking to open it. Right-click it with a metal or wood, then with up to four crystals, then with a Lava Bucket to forge. The bucket is emptied.
The Advanced Crafting guide explains the whole process.