Refined Square Cast

Overview
To start crafting these you will need to go to the entrance of Archos's Ice Cave (don't need to go down into the cave) and get some Frozen Crystal Ore.

Consume them to rank up Forging to rank 2, then craft Refining Forge which is fueled by Fire Essence.

"A strong metal cast, often used in construction and crafting."

- In-game description