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From Terraria Wiki
Orichalcum Bars are crafted from 4 Orichalcum Ore. They are necessary to make the Orichalcum Anvil, which is needed to create most high-end equipment, and is the equivalent to the Mythril Anvil, thus, making Orichalcum equivalent to Mythril.
Crafting all Orichalcum equipment, including the anvil, requires 186 Orichalcum Bars, or a total of 744 Orichalcum Ore. Without the anvil, you will need 174 bars, or 696 ore.
Orichalcum Bars can be found within Wood, Iron, and Golden Crates during hardmode without the need of a drill or pickaxe.
- Selling the ore rather than the bar yields 8 more per orichalcum bar.
- The drill mines slightly faster.
- 18.104.22.168: Sprite updated.
- 1.2.3: Now requires more bars to craft each item.
- 1.2: Introduced.