Veil of Elements

You summon a swirling mass of elements in a 15' radius, 40' tall cylinder centered on a point you cansee within range.  Each Creature that begins their turn in the veil or moves into it during their turn must make a Dexterity saving throw.  A creature takes 3d6 damage from an element of your choosing ( cold, fire, lightning, thunder ) on a failed save, or half as much on a successful one, which expends that damage type from the veil.

The spell ends once all four damage types are expended, or the spell's duration is reached.

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