Electrical Storm

A magical thunder cloud bombards the ground in a 30-foot radius, 50-foot high cylinder centred on a point within range. Each creature within the spell's area of effect must make a dexterity saving throw or take 4d8 lightning damage and 1d6 thunder damage, or half as much on a successful save.

On subsequent turns, you may use a bonus action to trigger the effects again.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the lightning damage increases by 1d8 for each slot level above 4th.