A black feather is traditionally read as mystery, protection and the wisdom that comes through difficult times. Dream books treat it as a symbol of inner strength rather than of bad luck.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.