Actually, that wasn't his sword. He left his sword back where him, Naruto, and Madara were fighting. That was his scabbard.Your So called Lord Sasuke already tried it but it is useless against Ancestor of all shinobis Lol Lol Lol
You must be registered for see images
You must be registered for see images
You can also view in lower scan that Sasuke's sword dropped in Lava.
Anyways,Only Madara's PS was known as Destruction Incarnate
Kaguya can reflect his attack right back at him just like she did the first time.