Torpestest’s Lightning Elm

From a point you can see within range, a burst of branching electricity erupts from the ground. Any creature within 10 feet of this point must make a Dexterity saving throw. On a failed save a target takes 10d6 lightning damage and is pushed 5 feet away, or half as much damage on a successful one. 

Additionally, the branching electricity may strike up to 5 additional separate creatures within a 30 foot radius sphere of the point you chose. A target must make a Dexterity saving throw, taking 4d6 lightning damage on a failed save or half as much damage on a successful one.