Your Celestial heritage grows stronger in your blood, as does the darkness within you. Shadowy bat-like wings sprout form you back as bonus action. They last until you go unconscious or dismiss them as a free action.  You gain the following benefits:

• You gain a fly speed of 60 feet.

• Increase your Strength score by 1, to a maximum of 20.

• You have resistance to cold damage and psychic damage.

• You have advantage on saving throws against psychic attacks and damage.