SHING!
Gravis' saber went through Jessy's entire body. Yet, obviously, this had not been the real Jessy. Gravis knew that cultivators and beasts with the darkness affinity had quite a talent for trickery. If he had believed this Jessy to be the real one, he would have unloaded the pre-loaded Lightning Crescent into her.
Jessy was a level four King. Someone with that power would not make such a rookie mistake like preparing themselves mentally when a fight was about to start. This had been bait laid out by Jessy to get Gravis closer to her. Gravis didn't mind the trap and jumped right into it.
The bisected body transformed into shadows as it vanished.
SHING! SHING! SHING!
Several blades out of darkness appeared around Gravis as they shot towards him.
WHOOOM!
Gravis' Spirit destroyed the will upon them, but since they had been created by Jessy herself and not by some external material, Gravis couldn't retrieve them with his Spirit Space.