Bow Shock

When an ally hits a creature that you can see within range with a melee or ranged weapon attack, you add an additional 4d8 force damage to the attack's damage roll. Each creature in a 15-foot cone on the opposite side of the target from the triggering attack must make a Dexterity saving throw or take the same amount of additional force damage as the target, or
half as much on a success.

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

Credit to reddit user u/Liusediana