“Use this,” said Mugino from next to him. “This is your job.”
In the next instant, a beam of light shot from Mugino Shizuri’s palm and headed straight for Accelerator.

[…]

Accelerator accurately grasped the vectors of that attack. He adjusted and focused the vectors to give them new form and properties. And then he used it to attack all three of the attacking girls at once.
Sound disappeared.
There was only light.
This went beyond simply piercing through them or roasting them. They disappeared. Not even a single piece or 1 mm fragment remained. They were truly annihilated

Toaru Majutsu no Index New Testament vol. 6 ch.7 pt.9