Sorrel's Retributive Missile (5e Spell)
From D&D Wiki
|Casting time:||1 reaction, which you take in response to being damaged by a creature within 10 feet of you that you can see.|
A missile of force flies from your hands, striking the attacker. The creature takes 1d8 + 1 force damage and it is pushed 15 feet back.
At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher you create an additional missile for each slot level above 1st. this missile must target the creature that attacked you.