This item was formerly known as the "Defiled Rune".
This item was a reference to the Defiled Chalice from the game Bloodborne, and it had some similar functions to it previously.
The sprite and tooltip were references to the game Celeste. The item's appearance was based on the Feathers from the game.
In previous versions of the mod, this item also made enemies have a chance to critically hit you for 1.5x damage, make certain rare items have a 5% or higher chance of dropping, and make enemies drop 50% more cash.
Before that, this item used to halve a player's max HP and increase enemy damage resistance by 50%.