Blood-Soaked Wings

As an action, you can summon a pair of black-feathered, blood-soaked ethereal wings. They cannot be used to fly, but they do require any enemy creature in line of sight in a 10-foot radius to make a DC 10 Wisdom saving throw, on a success, the creature takes 1d4 psychic damage, on a fail, the creature takes 2d4 psychic damage and is frightened unless immune to being frightened. The wings last for 5 minutes before retracting into your back.

This feat can be used once per short rest without detriment, any further uses are met with a DC 10 Constitution saving throw where the player sustains 1d6 piercing damage on a fail. On a success the DC increases by 2 for next time (and again for any subsequent successes).