Unleash Energy

As part of the first action when you cast this spell, you begin concentrating. Choose an element from acid, cold, fire, lightning, or poison. You store energy of that type while concentrating on this spell, and on your next turn you use your action to unleash the energy, making a spell attack against a target within range. On a hit, the target takes 6d6 damage of the chosen type.

While concentrating on this spell you have resistance to the chosen damage type and advantage on Constitution saving throws made to maintain concentration.

After storing energy, if on the second turn you take an action other than making the spell attack or if you are unable to take that action, you regain a 1st level spell slot (If you are able) and the spell ends.