I just found a sad/dead blue head (called "Fate" when I picked it up), and now I have half of a white heart (not a soul heart) and wings.
What does Fate do?
The Binding of Isaac – What Does Fate Item Do in The Binding of Isaac: Wrath of the Lamb?
the-binding-of-isaacwrath-of-the-lamb
Best Answer
The heart becomes a permanent one after you beat that level without taking any damage. The wings are permanent and let you cross ravines and spikes without taking damage.