In the stories of Norse, Celtic, Charlemagnic, and Germanic warriors and knights, many legendary weapons were spoken of, but a certain pattern existed in all those weapons.
[…]
“Simply put, there is the Slicing Power that can cut through anything, the Weapon Weight that creates tremendous destructive force, the Enduring Solidity that cannot be destroyed, and the Movement Speed that makes no one able to catch up to me. There is also Special Use, a rare pattern necessary to slay particular monsters, Precise Accuracy that automatically has me move toward the vital points, and the pattern I just used against you.”
“…The Attack Range, you mean?”
He had reanalyzed the laws behind the Norse Gungnir and Mjölnir, the Celtic Fragarach and Brionac, and other weapons, combined them, and then condensed them.

Toaru Majutsu no Index vol.18 ch.5 pt.5