You were born with the power of the cold and cunning of a fallen angel. Once per long rest, when you roll a 1 on an attack roll, ability check, or saving throw, you can reroll the d20 and must take the new result instead. Also you can turn your icy gaze towards a creature as an action. It must succeed on a DC 14 Wisdom saving throw or take 2d6 cold damage.
You have a small pair of flightless, gray wings growing from your back. You have a natural disdain for members of holy orders such as clerics or paladins, but will ally with yourself with them begrudgingly. Your voice is simultaneously hollow and guttural, you gain disadvantage on all Charisma checks against good aligned creatures as a result of your masked bitterness.