Wakka's Spark Trap

You snap your fingers and a spark appears in your hand. You place a second spark into a 5 foot circle on the ground centered within 20 feet of you.

You can place an additional spark as your bonus action on any turn until the spell ends. Sparks may not overlap.

As an action on each of your turns, you may activate all sparks created by you. This creates a 5 foot wide bolt of electricity between each combination of sparks within 60 feet of each other. Each affected creature must make a dexterity saving throw. A creature takes 1d8 lightning damage if it is standing on a spark and 1d6 lightning damage for each bolt that passes through it on a failed save, or half as much on a successful one.