Tempest Strike

You strike out with a melee weapon, unleashing the might of a tempest at a point you specify. Each creature in a 10 foot radius, 30 foot tall cylinder centered on a point you specify within range must make a Dexterity saving throw. A creature takes 3d10 lightning damage and 2d10 thunder damage on a failed save, or takes half damage on a successful save.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, either lightning or thunder damage (your choice) increases by 1d10 for each slot level above 3rd.