Calamity Mod Wiki
This page describes old mod content that was removed or replaced. The information here does not apply to the current version of the Calamity Mod.
IOU an item
  • IOU an item.png
Stack digit 1.png
TypeCrafting material
TooltipUse to craft any Leviathan weapon you want
Combined with Living Shards from Plantera to get your item!
RarityRarity Level: 1
Sell 2 Silver Coin.png
Dropped by
Siren and Leviathan
(In Pre-Hardmode)

The IOU an item was a Pre-Hardmode crafting material that was dropped by the Siren and Leviathan in Pre-Hardmode in place of their regular drops. It could be crafted into any of the boss's weapons when combined with a Living Shard.


Used in

ResultIngredientsCrafting station
Anahita's ArpeggioAnahita's Arpeggio histMythril AnvilMythril Anvil
Orichalcum AnvilOrichalcum Anvil
AtlantisAtlantis hist
Brackish FlaskBrackish Flask hist
GreentideGreentide hist
LeviatitanLeviatitan hist
Pearl of EnthrallmentPearl of Enthrallment hist
total: 6 row(s)


  • An "IOU" (abbreviation for "I owe you") is a document stating one's debt to another. In the case of this item, the debt is a drop from The Leviathan.
  • Despite the Siren and Leviathan dropping their weapons after the Wall of Flesh had been defeated at the time it existed, Living Shards from Plantera were required to turn IOUs into the boss' various weapons.