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The Corrupted Fragment is made in a Soul Forge by smelting Iron Ore or Iron Bars with Corrupted Essence as fuel, which produces 3 Corrupted Fragments. A single Corrupted Essence burns long enough for 8 operations much like coal in a regular furnace. 9 Corrupted Fragments in a crafting grid makes a Corrupted Ingot which in turn are used for the crafting of the Vile Sword.