- Increases Isaac's damage by 0.2 for each of the following items or trinkets he possesses:
- Increases Isaac's damage by 0.5 each instead.
- Having more than one of the same item (i.e. using Diplopia and/or, in the case of trinkets, Smelter or Mom's Purse) will increase Isaac's damage for each copy.
- Most items that are affected by Black Feather contain the phrase "Evil up" or "Sin up" in their description. The only exception is Goat Head.
|Ultra Greed Unlocks|
|The Binding of Isaac: Rebirth|
|Achievements||Attributes||Bosses||Cards and Runes||Challenges||Chapters|