Heated Sword Cut

By the time Aureolus Dummy finally snapped out of it, Stiyl had already created a flame
sword in his right hand. Not only that, he had also brought it straight down on him,
cutting off his left arm and left leg altogether.
The smooth motion cut into his flesh like a knife slicing through butter.
Roasted by a three-thousand-degree-Celsius flame, the surface of his skin carbonized. It
couldn’t even bleed.

- Toaru Majutsu no Index Volume 2, Chapter 2 Part 6