She was holding onto a safety pin, staring intently at the stone golem.

It was a bit plain to use such a weapon against a huge stone golem.

(Reverse-engineering self-regeneration formula, time period is approximately 3 seconds. If I want to make use of it…there!)

Index tossed the safety pin at the stone golem without any hesitation. The safety pin was rather slow, and forget about a stone armor, it couldn’t even prick a human’s skin. The safety pin arced and bounced onto the stone golem’s leg. After that, it was sucked into the stone golem’s body like a magnetic attraction.

In an instant.

Like a wedge that was hammered into a joint, the right ankle of the giant stone golem was somewhat stifled.

It was somewhat similar to the Spell Intercept. The stone golem had the ability to use anything around it to assimilate into itself and repair any wounds. On the other hand, if things that were unnecessary or even harmful to the structure were thrown to it, the self-repair system would have an error. An example would be leaving a fractured wrist alone and not doing anything to it, leaving it in a weird shape.

Toaru Majutsu no Index vol.6 ch.4 pt.4