Marian Slingeneyer’s other hand touched the magic sword’s hilt for the first time.
She clenched it.
“Charge.”
Immediately after she said that, a giant light fell down from the heavens, breaking through the roof of the domed facility. The shockwave blew in all directions. The outer walls of the dome creaked. A great amount of power filled the magic sword’s scabbard and the power that had been used up little by little was replenished.

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