Black Feather

The Black Feather is a item dropped by buzzards.

Crafting
Black Feathers can also be crafted :

1 Feather and 1 Black dye ( any position )

Usage
Black Feathers can be used to craft a arrow with the effect "wither" on it. The crafting recept is simular, but with a black feather instead of a normal feather.

They can also be used to make a potion: A potion of slow-falling is made with them ( Just like with phantom membrans )