One Piece: Invincible Starting From The Fruit Of Words

"It's useless, this is a spirit body. Physical attacks are useless!"

"You must use Armament Haki!"

After speaking, Lucifer waved his hand. "Flying sword!"

A flying sword, covered with Armament Haki, pierced through the air, instantly impaling the seven ghosts in the sky.

The seven ghosts exploded and disappeared without a trace.

Armament Haki is the nemesis of Devil Fruit users and can naturally attack the ghosts created by the powers of the fruit.

After dealing with the ghosts, Lucifer looked toward the courtyard of the castle.

Using his Observation Haki, he detected that Perona, the one who had created the ghosts, was hiding there.

And judging by the movement of her breath, she was trying to escape.

"She was quite decisive in running away."

In the original story, Perona also fled immediately after realizing the Straw Hat Pirates weren't so easy to deal with.