It had come from a giant white rhinoceros beetle that was 15 meters long.
Its form was constructed solely out of the curves, both gentle and sharp, found in biology. Its surface was covered with the same smooth luster as a new car.
However, its eyes let out an eerie green light and the tip of its thick horn shook. The thick horn was hollow as if its core had been removed, so that was likely the barrel. Despite having fired a shell, nothing like smoke could be seen coming from the barrel, so it may have used some special means of firing.
It was an eerie shade of white.

Toaru Majutsu no Index New Testament vol.6 ch.5 pt.13