Arc Lightning Rune

You create an Arc Lightning Rune that can be placed on any non-metallic, dry surface. The trap looks like a mundane object and requires a successful Intelligence (Investigation) check against your spell save DC to be found.

When a creature enters the Arc Lightning Rune's square they must make a Dexterity saving throw. The target takes 5d6 lightning damage on a failed save, or half as much damage on a successful one. The Arc Lightning also jumps to one creature within 5ft. The second creature must also make a Dexterity saving throw or take 2d6 lightning damage on a failed save or no damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the arc leaps from the second target to a third target for each slot level above 3rd.