With the woman known as Mugino Shizuri at the center, lines of bright, unhealthy-looking light shot out in all directions. They weren’t special electron beams shot out with the force of a lightning strike. Just like light, electrons have the properties of both particles and waves, but Mugino had the power to forcibly control electrons that remained in that “ambiguous” state.

When electrons that were fixed in that ambiguous state struck an object, they couldn’t decide whether to react as a particle or as a wave, so they would “stop” there. Normally, electrons had a mass that was incredibly close to zero, but that “stopping” created a false wall that caused a dreadful amount of destructive force to be strike the target at the speed with which it hit that wall.

That was Meltdowner.

The technical classification was Particle Waveform High-Speed Cannon.

Unlike the #3 Railgun, she was a Level 5 who manipulated electrons without using waves or particles.

Toaru Majutsu no Index vol.15 ch.4 pt.7