Although they hadn’t been seen yet, he most likely also had Enduring Solidity that made the sword unable to be destroyed, Special Use that was necessary to slay particular monsters, and Precise Accuracy that automatically had him move toward the enemy’s vital points.

[...]

Its strike was overwhelmingly sharp, overwhelmingly heavy, overwhelmingly fast, overwhelmingly tough, and overwhelmingly long, it held specialization to slice in two even monsters that could not be pierced by swords, and it even led its aim towards the enemy’s weak point that would cause the most damage.

Toaru Majutsu no Index vol.18 ch.5 pt.7