Then his fist collided with the chain skeleton.
Immediately afterwards, the clear flesh and blood and the rainbow-colored skeleton burst like a water balloon.

[...]

“Don’t let your guard down,” said Fran. “Some kind of haze is enveloping you!!”

[...]

It was not quite static electricity, not quite an aurora, and not quite fog. It was like the shininess on the surface of a CD. Some kind of vague haze was seeping out of the air and vanishing as it thinly surrounded him.

[...]

“But can’t I just destroy this rainbow karma stuff with my right hand?”

“Aleister has been raising Imagine Breaker in his city, so do you really think he wouldn’t have thought of that, human? You can kill the karma, but then you will bear the karma of killing karma. If you kill the child come to avenge their parent, you’ll only be attacked by their sibling.”

The more he killed, the more his karma would grow, so it would quickly snowball out of control. Did that mean it would be best to ignore it?

Toaru Majutsu no Index New Testament vol.18 ch.2 pt.2