Tempest Strike

A thunderous rumble exudes from your weapon as you cast this spell, lightning beginning to crackle around it. As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell’s range, otherwise the spell fails. On a hit, the target suffers the attack’s normal effects, also being zapped by electrical energy. The creature must make a Constitution saving throw, taking 6d6 lightning damage on a failed save, or half as much on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.