Calamity Mod Wiki
Defiled Rune
  • Defiled Rune.png
Stack digit 1.png
Use time45 Very Slow
TooltipWing flight is disabled and enemies can critically hit you
Increases most rare item drop chances and enemies drop 50% more cash
Can only be used in revengeance and death mode
Can be toggled on and off
RarityRarity Level: 11
SellNo value
Defiled Rune Indicator
  • Defiled Icon.png
Defiled Indicator.gif
The Defiled Rune Icon as seen in the Difficulty Indicator UI.

"Your soul is mine..."

The Defiled Rune is an item that can be activated and deactivated while in Revengeance Mode or Death Mode. When active, it has multiple effects on gameplay:

  • Wings do not work.
  • All damage sources have a 25% chance to critically strike the player, dealing 1.5x damage.
  • Certain items in the Calamity Mod with drop rates below 5% are raised to 5%.
  • Affected vanilla rare items are given an additional +5% drop rate.
  • Increases the amount of money that drops from enemies by 50%.
  • Some enemies will drop items that they normally will only drop in certain biomes.

It is obtained from opening a Starter Bag or by crafting it at a Demon Altar or Crimson Altar.

While active, the Defiled Rune icon will be shown on the bottom-left side of the Difficulty Indicator.



Crafting Station
Demon AltarDemon Altar
Crimson AltarCrimson Altar
Defiled RuneDefiled Rune1

Affected Drops[]

The following items' drop rates are increased to 5% while the Defiled Rune is active. If it is a vanilla item dropped by a vanilla enemy, it gets a +5% increased drop chance instead.

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Unique Drops[]

While the Defiled Rune is active, some enemies will drop items anywhere that they normally will only drop in certain biomes or normally do not drop at all. The following items' drop rates are increased to 5%.

Enemy Item
Armored SkeletonArmored Skeleton Bone SwordBone Sword
CryonCryon AmarokAmarok
Giant TortoiseGiant Tortoise(after any Mechanical Boss has been defeated) YeletsYelets
HopliteHoplite Bone SwordBone Sword
Sun BatSun Bat Hel-FireHel-Fire
Skeleton ArcherSkeleton Archer Bone SwordBone Sword


  • All drop rates of rare variant items are not affected by the defiled rune boost.
  • Although it disables wings, using the Rocket Boots or any of its upgrades up to Celestial Tracers will allow for brief flight.


  • This item is a reference to the Defiled Chalice from the game Bloodborne, and it had some similar functions to it previously.
  • In previous versions of the mod, this item used to halve a player's max HP and increase enemy damage resistance by 50%.