XV Episode 7
One of the hidden weapons Vanessa was equipped with.
Due to high-frequency emitters in both of her arms, her hands are able to vibrate at intense speeds, capable of severing even the intermolecular bonds of her target.
Despite the fact that it may be considered excessive to dispose of Elfnein, Venessa flung it at her with the intent of testing the functionality of her new right arm.
Swinging one's arm down in such a manner certainly is simply using it as a sword.