Forge Construct

Zonaite is processed by smelting it in a furnace. It is thereby converted into materials with useful properties.

Two such materials are Zonai charges and crystallized charges.

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Inside the Mining Cave.
You can trade 2 Zonaite for 1 Zonai Charge or 3 Zonaite for 1 Crystallized Charge.

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After defeating Master Kohga for a third time activate the blue ring next to the Forge Construct to activate it.