Shock Strike

Evocation Cantrip
Casting Time: 1 action
Range: Self
Components: SM* (a melee weapon)
Duration: 1 Round

Target. One creature within the reach of your weapon.
Attack Roll. Melee weapon attack with the weapon used to cast the spell.
Hit. The weapon attack's normal damage, and static electricity begins to build on the target. At the end of the creature's next turn, it takes lightning damage equal to your spellcasting ability modifier, evenly divided among all creatures hostile to you within 5 feet of the target.
Cantrip Progression. This spell's damage increases when you reach higher levels. At 5th level, the melee attack deals an extra 1d8 lightning damage to the target on a hit, and the lightning damage split amongst it and other enemies increases to 1d8 + your spellcasting ability modifier. Both damage rolls increase by 1d8 at 11th level, 17th level, 23rd level, and 28th level.

Source: Homebrew