Ball of Lightning

A 20-foot-radius sphere of wild lightning blasts into existence centered on a point you choose within range. The sphere continues to exist for the spell’s duration. Each creature that the sphere makes contact with when it appears as well as each creature that ends its turn while still within the effect area of the sphere must succeed on a Dexterity saving throw or take 2d6 lightning damage. The sphere makes its area difficult terrain as the shocks of residual lightning cause creatures' muscles to seize up.

Until the spell ends, you can use a bonus action on each of your turns to cause a bolt of lightning to leap from the center of the sphere toward one creature you choose within 60 feet of the center of the sphere. Make a ranged spell attack. You have advantage on the attack roll if the target is in direct contact with the sphere. On a hit, the target takes 4d6 lightning damage.

Creatures within 30 feet of the sphere have disadvantage on Wisdom (Perception) checks made to listen as the cacophonous crackle and buzz of lightning from the sphere overwhelms their hearing.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases for each of its effects by 1d6 for each spell level above 4th.