A clear sphere with a diameter of about three meters had appeared at the end of the magic sword’s scabbard. It looked something like a giant balloon, but it was likely something completely different.

[…]


“[…]As long as it is on earth, this sphere will rapidly absorb gravity. It is reflected around within the sphere where an apple will not fall down if you let go of it. As the power violently rages around within the sphere that has no exit, I just need to open a small hole at a single point.”

Toaru Majutsu no Index New Testament vol.4 ch.n pt.2