Primordial Hand

Select one of your hands (which must be empty) and choose acid, cold, fire, or lightning. The selected hand is temporarily transformed for the duration of the spell into a form that seethes with elemental energy of the chosen damage type. You cannot use the transformed hand to hold or manipulate anything for the duration of the spell. If you hit with an unarmed attack made using the transformed hand, it deals 3d6 damage of the chosen damage type to the target.

Additionally, for the duration of the spell you can project elemental energy from the transformed hand as an action during your turn, as either a 15-foot cone or as a 5-foot wide by 30-foot long line as you prefer. Each creature in that area must make a Dexterity saving throw, taking 3d6 damage of the chosen damage type on a failed save, or half as much damage on a successful one.

At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 for each slot level above 2nd.