I want to keep exploring the idea of giving every character something for each action. How about a quick cantrip for the wizards and warlocks out there?
Casting Time: reaction
Range: 20 feet
Components: V, S
When a creature enter within 20 feet of you, as a reaction, you can cause the creature to make a Dexterity saving throw. If the creature fails the save, it is dealt lightning damage equal to your level divided by 2, minimum 1.