The fine black sand was actually a precious kind of iron particle that was vibrating at the same frequency as the wind. The sword formed by the black wind wasn't very sharp, but it was still able to cut apart myriad objects. It could even penetrate the robust defense of a divine body.
"Raging Lightning Among Wind!"
The sword streaked across the Lesser Sword Domain like a bolt of lightning, shining brightly. The sword strike wasn't just extremely fast, it also possessed a divine strength capable of destroying everything.
"A Divine Sword Controls Lightning!"