The Gambler’s Will

You hold your hand out and golden particles appear around it and float to the palm, adding to a ball of energy forming in your palm. 

After the charge is complete, you must roll 1d20. If you roll anything below a 20, you and anything in a 10 foot radius take 5 psychic (if warlock) or 5 lightning (if bard) damage. Visually, when you fail, the ball of light in your hand will sputter and explode. If you do manage to roll a 20 however, you will get to roll 15d20 of either psychic (if warlock) or lightning (if bard) damage. Visually, when you succeed, the light ball will enlarge and then fire a beam of golden energy straight towards your single target.