You cause the projectile used in the spell's casting to begin to levitate near you by continuously whistling, sending a steady arcane signal into the missile that allows you to control it by changing the frequencies and tones at which you whistle. When you cast the spell, you can use an action to make a ranged spell attack against four creatures that you can see within 25 feet of you. On a hit, a target takes force damage equal to 10d4 + your spellcasting ability modifier. After casting the spell, as an action on your subsequent turns, you can repeat these attacks against creatures within the spell's range. Following the attacks, the projectile returns back to you and continues to levitate closely to you.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, you can target one additional creature with your attacks with the projectile for each slot level above 4th.