iron sand needles

And Misaka Mikoto did not stop there.
She snapped her fingers and shouted, “Be swallowed up!!”
The iron sand rose up in every direction.
It all began vibrating at high speed to create a storm of killer needles and then shot
towards Brunhild Eiktobel from all 360 degrees around her.
Brunhild grabbed her giant claymore with both hands and swung it around in a full
circle like she was performing a giant swing.
The explosive roar came slightly after the fact.
The air was agitated at tremendous speed and that deadly swarm that was being
controlled by great magnetic power was struck by the even more tremendous power of
the sonic boom created. The iron sand lost its form and was blown away.

- New Testament Volume 6 Chapter 7 Part 7