Dark Feathers is a contrail in Fortnite Battle Royale game, which is also a skydiving trail that you can obtain.
It fits the Nevermore Set.
When you fall, you can feel that effect behind.
How to get
The Dark Feathers comes with the Ravage Legendary Skin which is priced at 2,000 V-Bucks in the Item Shop.
It is the first item in the list that is tied to a costume.