EM waves

“Shut up, Biri Biri! You’re the one that destroyed all of my electronics with that lightning yesterday! What could you possibly want after that!?”

“It’s your fault for pissing me off!”

“I don’t even understand what’s got you so mad! I’ve haven’t laid a finger on you!”

Following that exchange, Mikoto attacked Kamijou with her full arsenal, but Kamijou negated the whole with his right hand. This time, her attacks did not end with Railgun. Her offenses ranged from twisting together collected iron sand to create a whip-like sword of steel to sending powerful electromagnetic waves to mess with internal organs to even finishing with a blast of real lightning from the sky.

But, none was a match for Kamijou Touma.

-Toaru majutsu no index OT vol 1 ch 1