A tunable and aimable artificial lightning producing device for tetanizing human voluntary muscle, disabling vehicular electronic ignition systems, and for pre-detonating wired explosives. A spark gap shaping apparatus controls a spark generated by a Tesla coil. A first stage directionalizer warps a normally spherical plasma field from the Tesla coil into an oval plasma field for confining the spark to within that shape. A second stage directionalizer converges multiple beams to successive points just ahead of a plasma field created by the first stage directionalizer without ionizing the beams, thereby maintaining ionization of a path of the spark. The spark is progressively arced to these points, thereby maintaining the path of the spark.