Tempest

You imbue yourself with a static charge. The area around you to a distance of 20 feet crackles with lightning.

When you cast this spell, you can designate any number of creatures you can see to be unaffected by it. Whenever an effected creature moves 5 feet in the area using it’s own speed or starts its turn there, it must make a constitution saving throw. On a failed save, the creature takes 2d4 lightning damage and is unable to take reactions until the start of it’s next turn. On a successful save, the creature takes half as much damage and suffers no other effects.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d4 for each slot level above 3rd.